I read it someway that you still can install streamyx even if >5km but have to sacrifice the speed.

Beg at TMNUT and says you are willing to accept the lower speed at your own risk. Maybe sign some document to release them from the responsibility if speed is below expected dl speed. Be pesistent and continue to go to TMNUT

Still cheaper than dial-up for 24\7 even if speed is 385 for a 1 Mb line.