I got a Zero Image 6x9 deluxe 2nd Edition as a birthday present:D.
A very nice camera,
but there's a problem: my cable release ("Kaiser Pro Cable Release") does not fit the cable release adaptor of the Zero 6x9.
The hole is simply too small.
Are there any adaptors out there?

why not get in touch with Zero Image, they are a sponsor here on APUG.

I have that camera and a standard cable release works just in case you have one hanging around the house

I also have the 6x9 and just ordered another.
I have noticed the cable release hole seems a bit tight with one of my releases, but fits better (IMO) with the more expensive release which has a narrower snout.
One option might be a different release or as suggested contact ZeroImage and see what he suggests.