Now that I more fully understand the situation, I think your only option is to make one yourself.

I am in a similar situation. I am days away from leaving on a cruise, and still haven't made my mind up about my sgian dubh. I feel, to be completely dressed, that I need a sgian dubh. I don't want to lose my beloved, (hand made by me) sgian, so it's staying home. I may just kluge together something serviceable at the last minute.