I would go with a 2.2GHz / 32GB / 512GB / 555x, probably can find a refurb
1) VEGA is nice but not while on a budget. Drone videos are typically not all that involving since the camera / sensors in them are not cutting edge by design, unless you do very fancy editing and effects with them which you didn't specify. FCPX is rather efficient on stock config Macs so I am venturing to guess even a 555x is enough for your use. If in the future you need much more GPU power then there is always eGPU route.
2) VEGA option is only available with the higher config and is new, which also means you cannot find savings in 3rd party deals or Apple refurb for a long time
3) Photography in general does need RAM. Lightroom while perfectly fine under 16GB, but it will like it when fed more. Photoshop quickly eats RAM as you throw at it.
4) You mentioned fine art being part of your discipline with even an iPad Pro involved, so I assume illustration / manipulation type of work will be done in Photoshop, which again needs lots and lots of fast storage for cache /scratch, and then having more RAM helps lessen the pressure in that.
5) 32GB may or may not worth it even if you need it, but, as you know pretty much current Macs all have soldered RAM, and this gen MBP happens to be the first to top at 32GB, so with future proofing the machine as an objective I would definitely do 32GB.
6) i9 speeds things up a bit but not at the proportional add-on price that they ask, with savings a priority then settling at 2.2GHz, which is still a 6 core 12 thread i7 just clocks slower.
I think this config will last you not only 3 but like 5 years, with the GPU being a weak link where you can expand with TB3 eGPU when needed.