I remember researching deep into the map files and xbe file way back when, and coming up with positive leads that the actual bsp was created in some sort of VRML-style scripting. (I believe something in the XBE led me to believe that, at least). If this is at all true, I think we might be able to figure something out.... or not...
BTW: What I saw in the xbe was something that had to do with WRL files and VRML libraries... I think I'll be doing some xbe-hacking over the next few days to try and find all that data again...)
I don't want to waste anyone's time, but this is just something that I had to post, to get out of my mind, after so long keeping this idea in my lowest sub-concious...