Personally I would suggest checking out the new Fuji X-T3 -- I just got it and am very happy with the video quality. It's actually the only other small camera right now that will do 4k60p 10-bit.
I just spent ten minutes skimming reviews and specs for that - it looks very nearly ideal for what I have in mind. Should be sub $1500 for just the camera body, no lens, and is under 500 grams.
