I also think that if marriage outside the covenant is a sin, it is not so grave as to be unforgivable. If you feel peaceful with your decision and you feel it is right that should be helpful.
I love talking religion with him and I have never pressured him to change his habits or anything else about him.
No walking your daughter down the aisle, no giving your daughter away at the alter, nothing but you standing outside the temple waiting till it's over. Really, I'm interested in this too.