I sported a big ole mustache for years then grew chin whiskers. Until one day while shaving my razor was really doing it. I mean it was going too nicely to stop. It took a while for my upper lip to get use to being shaved again but, I'm starting to get use to the new me look. Anyway, I've never thought of that needing a particular shape blade excuse for razor acquisition. Let me know if it works and maybe I'll try it.

Regards

Chasmo