Good morning...your dilemma is something I tried to tackle a few years ago here in Thailand and now I'm on year 5 of successfully being able to completely mask my location. First step is what you've already thought about and that's a dedicated, static IP address. There are only a few VPN providers that actually offer this. Some claim it's dedicated because the IP address you connect to doesn't change, but the IP is still in a range of 'detectable' VPN IP addresses. The next step is to set up a separate VPN router, which will be connected to your Thai ISP-supplied one. This VPN router will need to be able to use OpenVPN protocol, or Wireguard (much preferred). There are a limited number of routers that will come preconfigured to use OpenVPN and/or Wireguard, or you can buy a regular router that's capable of being flashed to DDWRT...most aren't and you need to do the research to make sure it will.
Torguard has worked well for me continuously. I can access any website I need to in the US at any time with zero verification issues, beyond those from expired cookies requiring it.
It's not easy to set this up initially, but there is quite a bit of documentation online and at Torguard's website to guide you along. I'm not an IT professional, just a semi-advanced user...on good days.
If you use OpenVPN protocol on your second VPN router, expect your bandwidth to be roughly 10% of your ISP's rated bandwidth, which can cause problems. With Wireguard you will get an encrypted tunnel for information protection, but you'll maintain about 50% of your bandwidth.
Hope that helps a little.