After much searching, and trying desperately to avoid buying yet more computer stuff, I have decided to mod the brackets ("posts") on a couple of cards that I already have. We'll see how it goes...

I plan on doing surgery on a blank bracket first for practice.
BTW, I DID notice that some ATI AGP cards come with BOTH the standard and the low profile brackets. A good choice on the part of ATI as those people setting up home theater PC's may very well choose their products in part for this reason.