No idea what the poor rescuer might want to do next, and he has a huge amount of life changes to face now, from being a superfit mountaineer one day, to a life of paralysis the next, all thanks to two utter *******, but maybe there is a route he could take, if he could face doing so, and that is a civil suit against them. He will now have massive costs to deal with, both changing everything in his life to his new needs, and then the ongoing costs for the rest of his life.
There may or may not be insurance through his role that could cover some of this, but frankly the pair of morons should also be stumping up a very large amount too.
Oh and as an aside, it always irks me that mountain rescue (and lifeboats too) have to do all their own fundraising and rely on volunteers. They should be properly funded out of taxation like all the other emergency services are.