As sgian dubhs for most people are ornimental, I ask does it matter if it's sharp or not? As someone who collects knifes I say its gotta be sharp.

It does sound like a nice piece and I'm sure you could have someone hone the edge for you if you wanted it, but I think you should ask yourself, what will I use this for, if it is used for dressy occasions, and all that will be seen is the top of the handle I say leave it. It's not like you will wear it everyday, so enjoy it for what it is,
congratulations on the new piece.