Advanced (uncommon) weapon profiency. How to go about it?

[Zwordsman]

Howdy. thanks for stopping by.
How does one gain proficiency in an Advanced Uncommon weapon? In particular Aklys.
If they were race trait’d I could pick them up via the human’s Unconventional Weaponry line—which ultimately would result in making that proficiency the same as your base class level.

But how does one normally gain proficiency in an advance weapon? And can you make it up to your class level in any other way? (Or at least can you raise to expert) Because several effects don’t work unless you’re expert. Such as Weapon Specialization.
(particularly with Alchemist. But in general as well)

General/skill feat Weapon Proficiency, would give you Prof in all Martial. One more time would make it 1 advanced weapon. Trained only.
Is there a way to make that trained higher? Not that most classes get above trained—but it would be nice to get it up to my class standard.

Anyone have any ideas on on the best way to go about gaining this on classes that don't have access?
(In particular for my case. Alchemist)

Thanks kindly.

[Xethik]

The Fighter multiclass feat "Diverse Weapon Expert" can give you trained access, and the class feat Advanced Weapon Training can allow you to treat it as a Martial weapon.

I believe the Uncommon rarity just means it is not "normally" available at stores, and harder to get the crafting formula for one. But if you are able to find one, you just treat it like any other Advanced weapon.

[Kyrone]

Humans have one Ancestry Feat called Unconventional Weaponry that let you pick one Advanced Weapon if you are trained in all martial weapons and with the Adopted Ancestry general feat any Ancestry can pick it.

[Zwordsman]

Ah advanced weaopn training + fighter dedication+that other one would work. Though quite late/feat heavy in that one section. But certainly doable to get Expert.

Kyrone wrote:

Humans have one Ancestry Feat called Unconventional Weaponry that let you pick one Advanced Weapon if you are trained in all martial weapons and with the Adopted Ancestry general feat any Ancestry can pick it.

I had originally used this trick, but I realized Unconvential Weaponry requires the weapon to be a race trait, or from another culture right?

"Choose an uncommon simple or martial weapon with a trait corresponding to an ancestry (such as dwarf, goblin, or orc) or that is common in another culture. "

So that doesn't work for stuff like.. Aklys I think?
"Traits Ranged Trip, Tethered, Thrown 20 feet, Trip, Uncommon"
it lists uncommon. but it doesn't list any race nor culture.

Uncommon tag does mention it could be from a culture/diff part of the world. but it also says it could require special training....
So would just having the "uncommon tag" without specifying ~how~ its uncommon, be enough to take that combination?