I've looked in on this thread with quite a keen interest, I do think there is a market (or three) for connectors using DF500 size holes, leveraging the ease, accuracy and repeatability of the domino to build both kd fittings cabinets and hybrid ones.
That said this doesn't seem to be the product to do it. It seems a muddled fudge creating as many problems / steps as it solves failing to utilise the domino's strengths and diluting them in fact.
What I would have hoped for (expected) was a connector that needs no tooling other than the domino in my hands, needs no change of cutter and minimal number of setting changes for use with the wooden dowel either side of it... for example: panel A to panel B 5 domino holes in each joining edge, all depth x in A and depth y in B with wooden dowels ito go n centre and outside holes, drill access hole for securing / tightening connectors with same domino bit only needing to change depth and edge offset once.
Fit two halves of connectors to either side, marry up panels, tighten connectors, check for true... done.
Any other pathway is more work than the existing options!!!
Having no cam or pulling force, needing to change settings and cutters, needing to use glue and clamps all mean you'ld be better off without the dominofix and using an existing option for example hafale red jig / drill for cam connectors and df500 for dominos, both set up once and needing no changes throughout.
Those with a CNC like JMB may have a different set of needs but I suspect there are more domino owners without a CNC than with