I mean, for DIY you only need one because you're only one user. Pick a VPS host with a data center near you... done.
I was lucky to find small paid VPN provider, that doesn't do marketing, pay for referral and stuff, and I'm sticking to it.
In this case, I agree that a single VPS is usually enough for most but never underestimate the market power of making things simpler and faster.
I'd say that even the known unknown that ips and networks change routinely should make it a headache to maintain.
Once you get your script to work, you’d have to wait minutes for the VPN to spin up in a new region.
Check out algo: https://github.com/trailofbits/algo
I think you could bake your configuration into a custom image, so it would be fast to get a VM started (about 30 secs on GCE, not sure about EC2).
If you use stopped instances, it's even faster.
(I work at GCP so know more about GCE than EC2)
(Not implying anything, just providing a discussion point.)
Even if you change residences, you'll typically be in the same state. Even if you change states, you can just set it up again in, what, super conservatively, under an hour (you've already done it once so fewer missteps).