Nothing but an 83 will work. Just cut out the bad part and solder in new wires, same thing you would be doing with that kit except for having the connector which is no big deal.
I've studied your picture for ten minutes and still can't figure out what that connector feeds. Your post says rectifier/regulator, but that connector is far too small. I can see we're looking straight down into the frame. I see the air box has been removed. I see the throttle cables, but after that I'm lost.
How many wires are in the connector, and what are the color codes. If that's all you have to replace, it should be a simple fix.
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