Looking for interchangeable Parts for the CenterDrive, there is the DualForce for File/Chisel and Saw.
And for the other Handle of the CD which is completely based on the MP600, there is a surprisingly large Selection of Donor Models
Many earlier Gerber Models of the last 2 Decades have Tools that are compatible with the MP600 and thus with the CenterDrive
Most Interestingly due to its affordability might be the Suspension Series including BearGrylls. And even more affordable the Suspension KnockOff Daicamping DL3
(Note that if have not yet tried the Suspension/DL3 Parts in a MP600/CD, but am just assuming based on comparing Pictures of Parts)
Pictures are borrowed from eBay Stores and Youtube ..
https://www.youtube.com/watch?v=wwS4j5EHgVM(Video of assembling the DL3)