[Sendric]

Yes. Feats can use choosers, but they only get one. In this case, you'll need to create a second feat with the Helper.Helper tag and bootstrap it to the first one. This will give you two feats (the second does not count against your total) that allow you to choose one the feats listed above. You will need to create a custom expression to limit the options. Something like:

component.BaseFeat & (thingid.kKnowNat | thingid.kProfSail | thingid.??)

You'll need to add the thingid's for your custom skills.

From here, you can create a script that adds your bonus to the selected skill. Something like this:

if (field[fChosen].chosen.field[kUserRanks].value >= 10) then
   field[fChosen].chosen.field[Bonus].value += 3
else
   field[fChosen].chosen.field[Bonus].value += 2
endif