Gear Ratio Swap Question

Wasn't sure what section to put this in:

I drive a 2006 TDI (BRM).

I currently have a 6 speed transmission on order from Europe because my 5 speed has failed me. When it arrives, I would like to replace the 6th gear of the new transmission with the 5th gear of the old one. Both of these transmission are O2Q. If my calculations are correct, this would mean for delightful low revs on the highway (1650ish RPM at 60 mph)

I know people swap out 5th gear all the time for a lower ratio. Is removing a 6th gear from a 6 speed 02Q and swapping in a 5th gear from a 5 speed 02Q mechanically possible?

Quick Bump. If anyone knows, I could really use the help.

Can't be done, the 5-speed and 6-speed transmissions are entirely different internal designs.

And yes, I realize that you are talking about the old-school 6-speed design and not the newer dual-layshaft design. Still, there is too much stuff different underneath that end cover for this to work.