I like the credit card size coarse DMT’s for field sharpening big knives, but since the Wave already has a diamond file which could be used to sharpen the BK7, I would be temped to go with a dog bone style sharpener to sharpen the Wave’s plain and serrated blades, but one of these would be a tight fit in the BK7 pouch next to a Wave. I think that I would go with one of the EZE-LAP diamond pens for the Wave and either use the Wave's diamond file for the BK7 or use one of the credit card size DMT's.
- Frank