Got the connection speed, attenuation and noise margins from the router?
Openreach doesn't move lines between exchanges unless there is a bright pink moon and a pig jumps over it
Looked at ethernet pricing? £2-3k install, and a few hundred a month.
Satellite - if you can get 1.5 Mbps from ADSL then I would not bother the usage limits are killers.
Considered 3G, if you can get it, or an antenna to improve signal helps this can go faster than 1.5Meg