The Temple vanity and rare / unusual deities

For the secondary benefit that the Temple grants you (the one unrelated to Day Job checks), how is it determined whether you have access to temples of your faith in a given city? Is it only the religions listed for that nation in the Inner Sea Primer (in which case, only the core 20 get the secondary benefit of the temple vanity)?
Or is there more of a "judgement call" aspect to this based on the city? If so, would it work as (or similarly as): medium cities have temples to the core 20 deities (except where specifically in opposition to the nation you're in, such as temples of Asmodeus in Andoran), large cities have temples to the core 20 and any that would be listed under "Common Gods" and under racial gods appropriate to the region in the "Other Gods" section of Gods and Magic (Besmara, Apsu, etc), and the largest ~5 cities on the planet have temples to everything, including the rarest gods (like the empyreal lords and the eastern deities).

tl;dr: If I wanted to make a cleric of an eastern deity, and give him the temple vanity, would it never grant me the free spellcasting, no matter where the scenario takes place?

I think this is very much a YMMV issue.

On the one hand, you paid for the vanity, and no matter how obscure your deity, I would be tempted to allow you to visit a temple after the course of the scenario, since day jobs are made during the session and I assume you are actually in the temple when you make your day job check.

On the other hand, if you worship a deity other then the core twenty, I would understand why some GMs would not allow you to visit a temple during your travels.

I thought day jobs were made between sessions during an indeterminate amount of time (so if a PC did worship an obscure deity, then they could just travel to wherever the temple is until called upon again by the Society; just as a PC who has an Artisan's Shop or Concert Hall - the store/hall is only in one place, and the PC would need to travel back to his/her store/hall).

Looking at the vanities that alter Day Jobs, the price of the vanity seems to be affected by the secondary benefit. The Memberships/Businesses that only alter day jobs (Hunting Lodge) are only 2 PP, but the ones that do a second thing on top of that cost 4~5 PP (whether a bonus to a skill check or some kind of discount), and more if it's a Property. So if the secondary benefit never came into play because of my deity choice, I'd basically end up paying the higher tier cost for a lower tier vanity.

The spells the temple vanity allows are useless after a scenario. As for calling on them during a scenario the only thing anyone can really say is to expect table variation. Perhaps contact a local venture officer for an opinion which wouldnt be binding but so you have a suggestion to make to the table gms that they will likely follow.

As to the prestige costs the usefulness of the skill outside of day jobs likely influences the cost. Vanities to substitute knowledge geography versus perception are likely not equally valuable.

Unless there is a rule written somewhere that says specifically that the day job is not part of the session, I don't see why it wouldn't be. The day job itself is not really an indeterminate amount of time either, since if it was an indeterminate amount of time, you could basically earn as much money from your day job as you want. Yes, there is an indeterminate amount of time between scenarios, but that has no effect on day jobs.

The spells the temple vanity allows are useless after a scenario. As for calling on them during a scenario the only thing anyone can really say is to expect table variation. Perhaps contact a local venture officer for an opinion which wouldnt be binding but so you have a suggestion to make to the table gms that they will likely follow.

So they are, but my point still stands, if you wanted a cure moderate wounds or lesser restoration after the scenario (but still during the session), I would let you have it personally.

The spells the temple vanity allows are useless after a scenario. As for calling on them during a scenario

Yeah, the secondary benefit of the vanity would only come into play during an urban scenario where you have a combat, then a stretch of time to go to a different part of the city, then another combat (e.g. two characters took ability damage, my cleric only has 1 Lesser Restoration prepared, we can't wait until the next day before doing the next thing). I'm trying to determine if this benefit would be rarely used or never used.

Yes, there is an indeterminate amount of time between scenarios, but that has no effect on day jobs.

It was my understanding that the day job was what your character was doing between scenarios *shrug*

he day job itself is not really an indeterminate amount of time either

Actually, it is. The Guide to Organized Play says so.

Permanent bonuses from equipment, feats, racial bonuses, and traits affect your Day Job check as they would any check for the rolled skill, but temporary bonuses such as those granted by spell effects, other than crafter’s fortune, do not contribute, as the duration over which the Day Job check is made is undefined and represents a longer amount of time than a spell’s duration would permit the bonus to remain.