Another mill. This one looks pretty nice

Rent a skidsteer with a set of forks - moving that thing will be no problem at all. As @jos51700 said, the head can come off and give you some vertical clearance.
Strapped proper to a trailer, a hilly drive will be no problem. Use the skidsteer to help turn the trailer around after unloading. You're probably looking at less than $500 to rent a smallish skid for a day.
That kind of deal on a decent sized BP is not common. I'd jump at it and make it work one way or another. I'm sure you could find some local folks to help with the relocation effort. It'd be worth it in the long run.

That mini-mill is a glorified drill press IMO.