if I remove the medium, small screwdrivers from a Crunch

[lurkee]

can they be replaced with the saw blade and a normal knife blade from some other multtool?  actually, the phillips can go, too. Dunno why they waste the space on those, when the bit driver will suffice? I'd forfeit the knife blade if need be, and just grind the serrations off of the existing blade. Hate those things!  Thanks.

[zoidberg]

Probably.
From memory there isn't a lot of room in there so they would have to be quite short and thus not very useful.
The tools are included so you don't have to waste space carrying bits.