Replacing part of wiring loom?

[Tuna]

I've got a minor rodent problem - the little ***ts have been having a go at the wiring loom on my pickup. Most annoyingly they've been munching right near the bulkhead, so there's no room to pull wires either way to fix them.

So is there an easy solution for splicing in a bit of new loom? I need plugs at either end, have to get them through a small hole in the bulkhead and don't want a huge bunch of individual plugs to manage. There are a dozen or so wires in the loom (nothing too high powered) and space is very tight.

Anyone got any suggestions?

[Tuna]

Thanks guys, it's sort of what I figured anyway. I've done small repairs before, but this needs a bit of organisation.