wouldn't one of these work, for $29 ??
http://www.soundprofessionals.com/mas_assets/full/SP-MICROTRACK-MINI-TRS-A.jpg
(or is this not what you're describing)
when I made the post originally, they didn't have it with right angle connectors.
I've since spent $100 on two separate interfaces that I don't really like a whole lot, and that one doesn't look like it'll address my issue with it being non-stealthy anyway since it looks like it'll come off at least 1-2 inches on the back of the MT. That's not stealthy to have a huge bulge coming out of a jacket or your pants or wherever you're going to keep a microtrack. (unless you want people to stare at a bulge in your pants, but personall I'd prefer not to give people any reason to stare at me when i'm trying to not attract attention).
So, I'm just going to make my own until I make something that I actually like and can use on a regular basis without it being inconvenient. I think SP is on the right track, but they never actually use their own products so they can't really know how inconvenient they are most of the time. (and the MT-INTERFACE they have is a good start, but the cable connecting on the left side rather than the top is pretty crappy to me, since with a large 1-2 inch connector, you're having the unit stick out to the side. I want compact and simple, not clunky and un-stealthy.
So, I'm just going to learn to do it myself.