I was going to say that I got sylvain/testing to work after a bit of playing around with. But I figured it was a useless thing to say unless I typed up the details. (Which I haven't done yet.)
Hi Joshua,
What problems are you having with osmocom-bb? It works fine for me on 850/1900 using the sylvain/testing branch (i think that's what it was) with similar patches to yours (the only difference is a patch related to simreader).
Nik