Attached Link: Mat Pose Edit

*"Then I'd delete everything but the material I was trying to alter. Then I'd delete every line but the one that set the transparency"*

I've done that before and it works, at least with MAT files, don't know about the mc/mt stuff.

If you're willing to use MATs, You can do it easily with Mat Pose Edit. Load your prop and (you can delete any materials you don't want to effect) -  under Edit, select Disable all material properties. Then double click on Transparency Map to enable it, add your trans map and save. You get a MAT that only affects transparency.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken