Thanks chaps, looks like it will be jumpers and hot glue.
I was hoping for a more factory look as one day I hope to see this thing and it's open at the back so any bodges are highly visible to any buyer...
Once you have the jumpers all in place and nicely lined up, you can create a custom connector body using carefully sized flat plastic and careful gluing. Perhaps a sandwich construction would be stronger, but even a single thin flat piece tying the individual connectors together should be reasonably strong.
If you know someone who works with plastic/models they might have the skills to fabricate something tidy looking.