Good grief! People! You are making it harder that it is! I have been painting the bevels for over 16 years, and I use the same technique for all mats. 2" wide, 3M, Magic tape on the mat before cutting, cut the opening, then burnish the edge of the tape down. Then you paint the bevel. Not hard.
On suede, I would make sure that I don't think the paint. The less water in the paint, the less it will bleed.
I have done Suede mats lots, and the nice thing is that if any paint DOES get under the tape, and on to the suede surface, all you have to do is wait for it to dry, and then use a blade to remove it from the top serface of the suede.
The main thing is PRACTICE, PRACTICE, PRACTICE!!! And then make samples, and SELL, SELL, SELL!!!