Few Germans have done it over the years.
I'm sure Gaz put some in his squareback or saloon a few years back and 90% if not all of the functions worked so he might be the man to talk too.
I looked at Digifiz a few years back and its is possible too, but you need full cluster, senders, stalk and wiring connectors and wiring diagram for each set up, then its hours of cross reference the wires.
Decided it wasn't worth a week of work at the time, but would be a really cool mod.