Could you measure your Krebs safety for me? I checked my SAM7 last night and found that there is a fair amount of clearance between the side folder and the receiver when it's folded. The tube of the side folder is bent inward on the top tube where it might bump the knob of the safety. It looks like I might have more than 0.5" clearance even without including that "dent"/bend in the side-folder tube. The important dimension is that knob for your index/trigger finger that helps you move the safety.
I may yet resort to your safety.