Oh, I just type out a string of characters, paste them into Paint.NET, adjust them as needed (in one row or several rows, either work fine, though the latter is better for compatibility with older cards) and there we go.
As far as BMFont goes, I couldn't figure out how to export properly tiled charmap... Of course I could adjust the spritefont to work with xml, but I have no idea how to reliably load external files. So, yeah... sorry. :(