you'll end up with a 200ms ping to Germany via your VPN if everything works smoothly at least from Bangkok. Not much worse than without. 200ms is still noticeable though. It's bad if you have discussions with multiple people because you the 200ms make the difference if someone else already started talking when you wanted to jump in.

It's still good enough that people likely don't notice. Definitely doable.

You definitely have to use a wireguard based VPN.