A recent diy, for someone who might need something similar. It's about as ugly as you get, but I only need one. If I make another, it'll look better.
I soldered a sync cable to a couple of metal tubes that fit over the pins, and made a plastic molded connector using thermoplastic. Thermoplastic melts at 140F, so you can just soften it up in hot water or in the microwave. It solidifies over a few minutes, so you have time to fit the pin spacing to your shutter.
The pins are about 2mm in diameter, so any metal tube that slips over them will work. That's ~15AWG. I used these just because I had a box handy. You can get brass tubing that's around that size. I squished them down a bit to get some friction.
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