A key part of the problem here is that the official PF2 rules for NPC creation are only releasing today from Paizo (as part of the Gamemastery Guide). We'll have that book available (and the NPC/monster rules) next Wednesday.
Along with the GMG release next week, we'll also be including some new capabilities that are not tied to the purchase of any add-ons. This should allow you to readily enter the assorted NPCs and monsters from Age of Ashes.
We had wanted to get all that stuff released today, but it's a little behind due to the crunch getting everything into place for group licensing.
In the interim, the approach suggested by @Sjmarshall is probably your best bet.
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