I got it the first time. The Nauticam 25056 adapter will do X & ground as needed for manual operation, and based on your statement “I have used that part is compatible with pretty much anything. It only has a central connection with X and ground” it fits the HS and has Panasonic-compatible contact locations. That adapter is connected to only 2 of the 5 Nikonos pins. Thanks.
The Nauticam 25013 adapter I was looking at is not compatible with Panasonic/Olympus, and they don’t offer anything similar for Pan/Oly.
That’s why I posted looking for Panasonic experience. I’m hoping the “bespoke” (I don’t feel qualified to use that word!) HW Lumix adapter will work. I believe it will be compatible with the GX7, as there are a number of other Panasonic MF3’s listed as compatible, as are my strobes. I’ve had great success with their DA product.
There is also a 10Bar adapter no. PA-HS-PG, that appears to have all pins wired from to their Nikonos BH, so maybe the signals are directly compatible from camera to strobe. Anyone have experience with (or care to speculate on) this part?