I would think one HiMax [that's 1kW, right?] would be plenty for vocals. Why would you want a sub? You are just vocals and guitar...no drums, no bass, no need for enhanced bottom...IMHO.
a small 4 channel mixer would be all you should add. I've gigged with much less.
I do like the EV Evolve stuff, better than, say, the Bose L1. I still have my Fishman SA220 [aka the Fishstick] which was my 'perfect solution' for solo gigs in small rooms over a decade ago and still is [vocals/guitar]; I have a scalable PA system [16ch, hotspot monitors, 8", 10" and 15" powered speakers for bigger stuff] but for solo/duo, less is more...and quick load in/out makes life simpler for us old farts...😎