Well, I finally got a suitable filter (Hoya 72m in this case; almost totally opaque to visible light) and started playing with infrared photography.
If you've never worked with ordinary infrared film, you won't appreciate this properly as a user. You don't have to load the camera in subdued light. You get immediate feedback on your results. Your light-meter works fine (the builtin one, which gets its data from the CCD). And you can pop off one or two infrared pictures in the "middle of a roll".
I was startled to find the preview on the LCD was essentially monochrome; I would have thought maybe black-and-red, on the theory that the color filters on the other pixels would block infrared very effectively. But apparently not; apparently infrared affects pixels similarly through all three filters. At least it seems that way after all the processing to make the image I actually see.