I have just had the same problem and to keep me on the road I have simply with hacksawblade cut the hoses off closest to the rear and used copper pipe and compression elbows and stainless hose clips to bypass the rear. I like the idea of getting around to bypassing the rear pipes with hoses. Have you any photos of the route you took and if you had to protect the hoses from rubbing? Thanks

Hi. I didn't get any pics. I just remember finding the route across fairly obvious.
I started from the rear left wheel arch, at the rear heater pipes, and fed each pipe over the subframe then over the rear over the propshaft. There are other pipes and cables over the propshaft there, so you can cable tie the new pipes. I used 4 or 5 there to ensure it wouldn't foul the propshaft. Then it's an easy route to the 2 pipes underneath the right sill to join it all up.
The whole job took and hour or so. Must be nearly a year since I did it, and I've had no problems at all.
Good luck!! 👍

Many thanks