I don't know what FPV means, but my brain is reading it as 'feline papilloma virus,' so I'm choosing to believe that it's a thing and it's a special interest of yours and that you're just randomly mentioning it...and also randomly mentioning the additionally unrelated fact that you're a software dev.
But honestly go with the camera body that's right on the edge of your budget
Having a full frame camera is really nice though I've got a Micro 4/3 camera. Basically if you want to adapt lenses having a full frame sensor makes all that easier.
I got slammed with ADHD, autism, and genius... I have more ideas than I can count, plan them out in detail, then get distracted by my next curiosity and shelve the last one with the rest of them.
Bonus points, I got the expensive hobbies one too, so I have a tackle box full of chainmail rings, a bunch of Raspberry Pi Nanos, a full-sized Raspberry Pi with a bunch of sensors and addressed LED strands, and TB of hard drive space chewed up by half finished projects.
Just reading that reminded me of a half-dozen projects that I haven't touched beyond buying the parts for. And another bunch that are mostly working, but could really use some finishing touches so they aren't as jank, but they made it to the barely functional stage, so that's where they'll probably stay until they fail enough to get any of my attention.
Do what I do with my expensive hobbies. Learn how to make your own fursuit. Start with simple sewing and work your way up. Once you get there you can make other fursuits for $
Photography (Sony A7IV), 3d printing (Bamboo labs), motorcycles(BMW S1kRR, the best gears ATGAT), computers and networking(custom-built pfsense and the entire house is wired on 10Gbe and some 2.5Gbe), Home automation (home assistant), security cameras(4k and 8k cameras on frigate w/google coral). The list goes on and on. The good thing is I already have the best of most of my hobbies and "remembering" my old passion, I don't have to spend too much more to get back in.
Video games and electronic DIY stuff... And what really pisses me off is that in the current age, there are so many neat parts to use but RadioShack doesn't exist anymore! 😬