OR, if sending it for honing becomes an issue, I'd suggest the following: "My love, your gift of a razor was one of the most thoughtful things anyone has ever done for me. Sadly, I couldn't get it to work. Rather than have it become an issue between us, I have found a guy named "maplemaker" that is more than willing to take it off my hands, so we never have to worry about me slicing myself up or you being upset that I don't use your lovely gift as often as you think. What a noble gesture he has made, in a purely altruistic concern over our love and long-term relationship."

Yep, I think that will work just fine.

Welcome, man. Get that thing sharpened and enjoy the ride! This shaving stuff is one of the most enjoyable things I do, which means that it's a really cool thing to do, or I lead a really boring life... the jury is still out.
Again, welcome!