I would like to help you but I honestly don't have any idea what a mini peasant is, what it looks like, size etc., and there are thousands of 7" overall fixed blades out there. Which one is yours? A couple of photos would help to start with.
This is assuming you want a custom made sheath and to carry both implements and that will probably be what it has to be.
The very first sticky at the top of this forum is a listing of custom makers, including me. You might select one or two there and contact them directly.
Good Luck!
Edit to add: I just saw your post of last Wednesday with the fixed blade photo.
My previous advice above is still valid, and if the mini peasant isn't too far from norm, it should be a doable task. Note the 5th photo below in my sig line. That's a fixed and folder sheath.
Paul