Why not Barb as the lowest if I may ask? Rage and go hit stuff, seems like the simplest class to play to me.

I like this summary of each class, it includes a ‘difficulty’ rating for each:

link

I don’t see a specific rule for this, but I would just let them ignore the restriction of picking a certain number of archetype feats before selecting a new archetype. There’s nothing preventing you from picking a 2nd level feat at level 4.

https://2e.aonprd.com/Rules.aspx?ID=1333

I’d really love to support Paizo and buy all the cool Foundry content, but man 60 bucks is a lot.

Pathfinder 2e didn’t work out well in my main group, so Ive started running Abomination Vaults for my kids. It’s a lot of fun but the younger ones drop in and out, so my oldest ends up running all 3 sometimes.