TLDR version: yup. You'll be perfectly fine in a mildly optimized play party. There will be a lot of issues with action economy and timing that makes it wonky to insert.. but you'll be fine. It'll be hard before level 6.. and really you're first several discoveries (and probably feats) are auto choices for sake of playability.
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Honestly it is reallllyyy hard to swing in actual game play.
The biggest issue is... action economy, and how quickly it becomes inert.
Standard to make. move to apply. lastsa for 1 min.
It isn't even 1 min per level. Its a flat 1 min. forever and ever and ever. Meaning you really do have to use it in battle.
Then in general the standard action is problematic. Say you try to make a contact Toxin (su). Lasts 1 min.. and must be thrown as a range attack.
So one standard action to make said poison, then some action to throw it--you don't get a free throw with making it. Can smear it as a trap as wel.. but lasts 1 min so really not many opporunities. There are multiple instances of problems incurred because of the action economy.
With "Envenom" you can create and apply it as a move action--but note.. its one action so it can not be used with the above contact. Just to weaponry. Still it makes it much more usable at least. Its a discovery tax like Infusions though.
All that said above.. If you sink lots discovery and a feat (or more) into the poison buffing discoveries this can be quite a powerful too. Celestial Poisons, and Sticky Poisons are basically absolute musts for this character. So you won't have to reapply that often, and so your poison effects so many things more. Malignant poison maybe.. but it takes a full round action.... Good for an ambush opener though!
or instance... zombies. Though I honestly have no clue how Celestial poison's bypass would interact with the stat damage. It should bypass anything but SU abilities or spells I guess?
Really if there was some discovery that would allow creation, and application to be a swift action. OR. something that would make it min/per level. or 1 hr. Then this archetype would work pretty well.
Paralystic or sickening toxin is also very good IMO.
Honestly I would leave any of the alteration abilities (toxic fumes, tailored toxin, contact, or normal changing discovery) behind.. it simply can not last nearly long enough for any real preperation.
This would absolutely positively be good with a Syringe Spear--or Injection spear preferably if your group allows that one. It is a shame you lose out INT to damage on Splash weapons though. Points if they allow you to use a few feat choices for dex to hit with it. But its still a bit extra DC to it (unless you dip into that Rogue archetype or Investigator that gets it-Which is actually mildly tempting because of various effects). It works great with the level 2 extract that makes that poison int damaging water.
Alternative would be a eleven curve blade. or branch spear.
You can also sky rocket the DC with a few specific choices and some weird heritage as a human.
You will absolutely always be discovery and feat starving in this build though. Or, you're poison won't be as effective. It is pretty solidly all or nothing kind of thing.
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Speaking of extracts.. honestly for this class they feel out of place. I sort of wish it gave you several specific poison related ones. Like "create X cost poison in this extract" or something.
Or if there were archetypes you could switch out some or all of extracts for some other thing.
'cause it'll be hard to fit Infusion into this really.
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My personal opinion is that it isn't strong enough in various ways compared to Toxicant-which only costs the Mutagen's abilties. (though maybe this is PFS legal ? i know toxi isn't)
Toxciant can't do ability damage... but it is just loaded with stats and HP damage.
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Darn I forgot what else I was going to write because I paused halfway through this.
