The primary thing about the ParaTool is that the plier head must fold into the handles on the sides, instead of the insides. Adding a longer tool to either side (even removing the washers) would cause the plier head to not seat within properly. That may not be an issue though. Depends on how he carrries it.
I could personally deal with the pliers not seating all the way in. Doesn't seems like it would affect the usage, aside from it not closing perfectly.