It could fit, all you need is to trim it a little smaller. The problems are, that the genuine tricompax navitimer uses a 7753 movement, so:
1: If you go with a 7753: Since the A7750 with the upper module is a thicker movement, the stem and pushers wouldn't line up,
2: If you go with the stock A7750: The date window is bigger, and closer to the outter edge on the 7753, so the dial won't fit.
Greetz.