I am sure that one of the many cable makers would do a custom piece for a price. There are so many that I hesitate to suggest one, but check with Cullen Circuits for example.
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When I went to hookup my KCT preamp to my FPB amp I had to order a special 12v adapter from Krell. It shouldnt be that way but it is. The KCT also has a couple std 12v trigger input/outputs I believe, if that is your pre amp. It has been so long since I saw the adapter I forgot what it looks like. I could not find a picture of it on Google images. I would call Krell and see what they say. Maybe they have one already for this situation.
Good luck, John