yes, I'm aware of the ECU/software modifications. And there's also a suggested safe diode for the T7 BPC. Haven't had it installed on my C900 with T5 and no problems yet...In the 9000 the fuse for the T5 valve does not always protect the sytems, as I found out to my cost.
if you go with a T7 valve, be aware the software in the ECU needs a slight tweak to make the T7 valve work, and there is also a small hardware, wiring modification in the ecu that needs to be done.
In the fusing of the DI etc, I can not comment.
I've made one conversion in my life but I'd like to make the next one more precise to the original requirements of the 9000 diagrams..