Update:
Just finished surgery & I think the 20D is going to pull out of it okay. It was touch and go there a few times, and I had to go back in twice to make sure ribbons were tightly connected, but she's up - fully charged - and shooting. I didn't replace the filter with anything, so the focus will have to be manually adjusted, and right now, the full spectrum of light is being exposed. I've decided the cheapest way to do IR photography is to buy a lens mounted visible spectrum & UV light filter. I can't wait for daylight to try out some skylines / landscapes / etc. Right now, everything in my basement is pretty boring looking as a full spectrum photo.