I take advantage of Apple's no questions asked return policy for stuff like this:

Take my laptop in to be repaired, buy a brand new MBP at the same time. Load everything onto the new laptop using a time machine backup (takes about 2 hours), and use that while they're repairing my laptop.

When my laptop is fixed, I pick it up and return the one I bought at the same time for a full refund.

It's a bit of fuss making sure I keep the 'free-hire' laptop completely pristine, but it's fun to use a brand new machine every so often.