I don't think this really qualifies as a mod. But I received this as a gift so it didn't feel right to sell this (Not too crazy with the Xacto blade feature). So I disassembled the entire thing and slotted in a P38 and used a ranger band to hold it in. You don't want the ranger band to be too tight as it would make this less accessible. It's not an exact fit in the slot but you can always go tighter in the ranger band.
I've thought about filing off the edges and drilling a hole in the P38 then have it pivot out of the pivot screw. But I figured it would be hard to use it as a can opener.
Anyway, nothing much to brag about, but enjoy!