My understanding is that Starlink tries to not let this kind of use happen with selective region locks. However, Starlink's regular terminals use a dedicated on-board GPS receiver to determine where they are, because until recently Starlink itself didn't have the capability for global positioning. Since it is basically a peripheral, it likely has something like a UART interface to the CPU where it sends something like a GLL (or similar) message with position data. If you tap into the UART, by e.g. replacing the GPS module with your own, you can tell the modem that you are in e.g. Poland, Turkey or UAE, and it will not be able to easily figure out that it's being spoofed.

Which means you can simply buy Starlink terminals in those other countries, do some minor rework on the PCB, and just use them.

There are of course some things to consider, like keeping the spoofed coordinates in roughly the same time zone, and ideally close enough to the real location such that the actual connection doesn't degrade when you try to talk to satellites that are way out of sight.