You don't have rearview mirrors?
Well, I just don't know how compatible they would be with the Siemens ECU...
I think Kopf follows the Italian philosophy of "What isa behind you doesa notta matter."
The Siemens ECU and/or the ABS unit may depend upon the cluster for some processing functions, best to get a realistic assessment of that before going too far.
As an example, the Magneti-Marelli (and other maker similar units) clusters for the 2nd and 3rd generation Monsters provided the turn signal blinker function.
The MotoGadget stuff is quite capable and adaptable, and may be able to piggyback off of your existing trigger-wheel/sensor to provide road speed.
Worth consulting with them on that.