So I'm new here and not sure of anyone's tried this before, so I thought I'd post it anyway.
I have a Mk1 Workchamp SAK and I only just realised recently that it doesn't have the 2nd smaller Phillips head screwdriver under the scissors. Luckily I got it at a massive discount from a supplier many years ago so I'm not too worried.
Anyway I figured that extra space below the scissors could be useful, and spotted even more space under the 2 saws. Turns out the gap was about 6mm wide (and varying depth), which is big enough to fit the ferrocerium rod on a 'Light My Fire' branded firesteel. Only problem was a the massive red plastic handle.
So I spent this evening with a hacksaw and a Dremel and managed to cut off enough plastic to make it fit in the gap, with still enough plastic to hold when I take the Firesteel out.