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Looks like this requires some custom fab at the very least.
The 6 speed on the Z4M isn't the same output shaft/spline design as the E46 M3 or the E36. I'm not sure if I recall the technical/mechanical bits perfectly but I took away it wasn't a match. (I dug into this a bit looking at converting the 5 speed box in my Z3M to a 6 speed plus diff change). E46 gearbox, yes, Z4M no.
What don't you like much or want to improve? Motor mounts, transmission mounts, an Autosolutions SSK or CAE shifter does wonders. Gear ratios not to liking? 1st to 2nd grind?
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