I don’t think you need a box of any kind. Just tunnel into a server that is in the location you want it to be in and proxy traffic through that?
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.