Cheers guys, as I said I'm really trying to avoid a jury rigged solution. It's strange that there should be no panel mount options available.
That said, it would seem the breakout board would be my best option. I can avoid puny soldering points, it supplies mounting holes and offers more of a professional feel than some form of drilled out, spliced together stock cable.
Hadn't thought of it before now, so thank!
It'd still be way easier to use a pre-fab cable with panels mounts so I'm still looking for that if anyone knows where to find them but in the mean time this is definitely the route I'll be taking