I'm thinking of using the (fairly new) With Muskets, Pilkes & Drums by Partizan Press. I've been after the same 16th C Colonial themed rules/level for my Portuguese and Tupi in Brazil, and they seem to fit, imo.
It's a bit like Hail Caesar for smaller actions regarding the basing too - no set figure count, removal or base size but Small, Regular and Large. So any collection fits really. Also has emphasis on Aztecs and Conquistadors etc - it covers both Colonial and European conflicts in the 16th & 17th C. So there's specific rules for taking prisoners for sacrifice etc.
I was a bit peeved on discovering that both the new versions of Rampant and Billhooks would practically ignore early 16th Colonial, but WMP&D appears to be what I'm after.