alchemist archetype replacing persistant mutagen

[Patafoin]

Greetings

I'm looking to use two archetypes of alchemist at the same time : construct rider and preservationist
The restriction from my GM is "you can use multiple archetypes but they must not replace the same thing"
The construct ridder replace the mutagen and say that you can never gain the mutagen or cognatogen ability, even from a discovery or another class.
The preservationist replace the persistant mutagen.

I'm wondering if those two archetype can combine.
You may say "the persistant mutagen has no interest by himself"
I'll answer "you can still use the mutagen of another alchemist in your party and benefit from the persistant mutagen considering the prerequisite to gain the effect is to be an alchemist, not having the mutagen class-feature"

Thank you :)

[HammerJack]

You put this in the 2E forum by mistake.

[shroudb]

This should probably be moved (or reposted to) to pf1 questions since you are now at pf2 section of the forums.

[Patafoin]

oops, my bad (i'm new on the forum) ^^'
how can i close the discussion or archive it ?

[HammerJack]

I flagged it as in the wrong forum, so hopefully it should be moved when someone gets to it.