I decided to design a piece that would allow this. Basically I worked out what minimum size of hole I needed for the plug and then worked from there. The cable itself, within the flexible conduit, could fit through a standard 20mm grommet. This meant I could create a piece from aluminium to cover the hole up once the connector had passed through. Again, I used Solidworks to design and a local company Ocean Kinetics to mill it for me. I polished it on the polisher before passing the wire through it and fitting to the bulkhead with M5 button head set screws. I had to dis-assemble the connector to get it through.
