You'd probably need a billing address and credit card from the country you are trying to register in. You can probably just pick whatever (valid) address you want, but getting a credit card would be hard, and billing addresses not matching the address registered with the bank tends to trip fraud detection systems

Yes you can via a VPN and an “address” in that country. I wouldn’t recommend doing this with your primary google accounts though since you are working their system some they might retort in some way.

We're doing the right now!

There's a reddit thread on how to do that with Pokémon go, basically make a new Google account with a Turkish address and add your credit card to that then use the web playstore to download an app with that account to your phone, then sign in with your normal account but now purchases are at the Turkish value

You can cancel your subscription and start a new one locally at the cheaper rate.

You do not have to create a new account and lose subscriptions. When I moved countries for half a year, I had to change my Google Pay address. I seem to r3member needing to cancel every single one of my subscriptions on that service, then re-sign up with them after changing my address. I may have forgot to change my address back, so I am still paying for a Youtube Premium family plan in Filipino pesos.

You can change your Google account country, but I think you are limited to once a year or something like that and proof is needed.

What does 'residing abroad' mean? In sounds like a bit of an oxymoron, how can you reside in a country you're not in, right? Perhaps you legally reside in a country you're not physically in? Or you moved such that you established residency in a new country? Or do you have no legal residency?

In the first case, I would guess you're not permitted to move accounts, because your country of residence hasn't changed. It depends on the terms of service though.

In the second case, surely -- you reside in a country that has lower fees, like any other resident there.

In the last case, I really don't know! I've been there for a few months while waiting for paperwork. I left my accounts as-is to avoid problems.

e.g. I immigrated to Vietnam and moved my Steam account. I kept all purchases and all history. I provided my new address, and get the regional lower fees. Same with Netflix.