My two concerns about using the phillips from the Kick,Fuse,Blast is the extra cost of buying the extra sacrificial multi-tool and then voiding the warranty on an expensive Charge or Wave. Besides not being all that handy and being able to perform the necessary surgery.
That's why I was thinking that modifying a $1.00 hex bit extension would be the easiest, less intrusive. For that matter, you can get longer bits and just grind them to fit the slot and not even use the hex bit extension. Though using the extension gives you the most options.
Either way, I wish Leatherman would just use the phillips from the Kick,Fuse,Blast in the first place. Oh well, then we'd find something else to complain about I suppose.