If you want to permanently change your Valorant region, Riot Games does support this. However, there are restrictions based on your physical location. If you want to play with friends without the risk of losing your current season's rank, then using a VPN is your best bet.
Can You Play League of Legends With a VPN? Yes, you can play League of Legends with a VPN. Doing so has an impact on speed and latency, so we would recommend playing with a VPN that has high speeds and a latency as low as possible.
