This looks like a great start to your project! Meso-american warfare has always been fascinating to me. Your planned supplement might be perfectly timed, as I understand Wargames Atlantic is beginning to do a set of Aztec and Spanish in 28mm hard plastic. No idea when they’ll appear.
Hope your job search – when things get back to normal – goes well. And maybe the NHL post season will be cancelled so you don’t have to see the Leafs beat the Bruins.