One you plug into the network in the location you are supposed to be, and the other you bring with you on your travels and plug your computer into over ethernet port. The one you bring with you can connect to any wifi or be hard wired. It has one job: tunnels all your data through vpn to the other box you left behind.
Does this exist? Seems like there could be a market for it now.
It would be easy enough to test it out if you had a sales channel in mind: give it a shot and if somebody wants to buy one, slap together something with Wireguard and two Raspberry Pis and build from there.
The main problem I see is getting steady access to qualified leads, since I would assume "remote workers who are trying to hide that they are in the wrong country" is a particularly difficult cohort to track down reliably to market to. Honestly, if you could detect such people at scale, selling your system to HR departments may be a better business.
But there's a potential for a business here: rent small spaces and offer to set up the small boxes for a fee.
This box allows them to build a virtual network cable back to their usual, residential connection - completely invisible from the other side (besides latency, but this can be explained away).
You can run wireguard on a raspberry pi (which are hard to source these days) or something like an HP SFF workstation which will run you ~$50 on ebay. Both of which are useful for other things asides from vpn tunneling.
What you're describing is just a router + WireGuard. I have a server with WireGuard that acts as an exit node in tailscale network and RPi with WireGuard that acts as SoftAP that routes the entire WiFi network through that WireGuard connection.
For this solution to be truly plug'n'play you need to figure out how to punch holes in NAT. Tailscale has ways of connecting two nodes even if both behind NAT and block UDP.