1985 VF500F Regulator in 1990 VF750

The rectifier in my VFR750 seems to be on its way out.
It left me stranded in a left turn lane in rush-hour traffic probably 10km or so from my house. I got a boost (it didn't want to bump start) and managed to make it home eventually but the battery was completely drained.
I got the battery load tested and it was fine. I checked the coils and they seem to be fine. Regulator is giving me continuity between one of the stator inputs and gnd, which I am fairly sure is wrong.
I am planning to order one from a late-model R1 as that is what I have seen a number of people do in other threads.

In the mean time, I have a VF500F that I am [slowly] working on. It ran, albeit poorly, when I took it apart.
Can anyone think of a reason I couldn't use the 500s rectifier? It is 6-wire deal but the 6th looks to be just a feedback loop going through what I am assuming is the acc or on-position of the key.
I already have a wire from the acc going back to the rectifier as the previous owner did the PC fan thing.

The only thing I am a little foggy about is what is going on inside the VFR rectifier. The 500s wiring diagram is a bit more descriptive.

Thanks

 

As no one gave me a reason not to, I went ahead and did it.
Long story short, it seems to be working.

For anyone interested, here are a few pictures of the process.

Testing to see if it would work.


Holes drilled out wider and corner hacked off


Test Fitting - I had to cut off a bit of the bracket on the left.


Final (more-or-less) placement.


I ended up cutting off the existing bolts, drilling them out and tapping the holes.
They weren't long enough and the top bolt was stripped anyways.

I think it turned out alright so I may just leave it this way unless it starts giving me trouble.

 

It has been almost exactly a year since doing this and I've put quite a few kilometres on the bike - due to the weird winter we had this year, I never really put it away.
I have not been stranded yet so I guess it is working out alright. The rectifier never seems to get ridiculously hot even when it's hot enough sitting in traffic that the rad fan rarely turns off.
I ended up installing a cheap LCD voltage meter where I guess the clock would go out of paranoia - everything seems to be fine but I turn it on every once in a while just to make sure.