Hi bitm.
As mentioned from behind, indoors hit and miss, outside miss, but is there any reason for not reaching a hand with remote in front and pointing the remote at the sensor under the release button, I regularly do this if I'm doing landscape on a tripod.
I was going to suggest a 2.4ghz battery grip with remote, but I just checked and it looks like they don't do one for the 5DII, plus a grip on a tripod is not a great idea unless you are mounting the lens foot on the head.
Is the repair costly enough to invoke insurance, some of the cameras have the remote, USB etc. as a daughter board easily replaced without too much hassle or cost. Of course others have mentioned here in the past falls like that shifting the AF sensor as evidenced by a large increase in AFMA values so it might be worth having a thorough check done on the camera.
Good luck.
Cheers, Graham.