[bilyo]

I know you don't want to hear this. Don't do it. Even with a small flat on the corner, over all, it is going to be a delicate edge subject to easy damage over time. If you must do it, do it with a lesser angle, maybe 30 deg; similar effect, but easier (a little) to do. If I were do this, I think I would consider applying the angle as an edge molding; not quite as elegant, but easier and repairable if damaged.
Again, if it must be done, I think the best way is to make a rough cut on the table saw leaving a small amount beyond the line and then use the router to trim to final dimension.