Yes it does seem like the 'smart' option, money wise. Probably could resell at around the same price if it wasn't for me.
I also have to take in consideration I'll
need the battery grip and the FTZ, so there are additional costs.
4.5 fps kind of concerns me too. But in the ~6 months I owned a K-1 (which also had a 4.5 fps burst) I managed to photograph an airshow and was pleased with the shots. It was more of pretending I was a sniper, in a way, in trying to anticipate THE shot and taking a narrow burst around that. So I had to be careful and creative in the technique. Lots of careful anticipating the direction of the aircraft.. and quick reaction timing. I really wish they'd up the rate to at least 6fps. I suspect this is a firmware locked framerate.
Probably not a concern of either of you, but I also am very much looking forward to shooting video on this thing. I hate using the LCD panel on the back, especially in daylight where it becomes next to impossible. Having a viewfinder will be excellent. It also looks like it takes THE best looking 1080p video out of all the MILCs and DSLRs
https://www.dpreview.com/reviews/nikon-z5-review/6 Even better than the Sony and Canons. Not bad.
With all that is going on in the world, a camera might be one of the lesser concerns though in a few months haha.