Glorious adventure? That's screwing around in the pack itself. Sometimes including a loud ZAP and being flung against a nearby wall or something with sharp edges.
But yes, it's as simple as identifying & soldering the pins. I'd tend to use rosin flux and "silver" solder.
the silver solder I mean isn't the kind used for hardware, it's a better conductor than 60/40 types.
If you want some of the silver stuff, send me a PM & I'll send you a couple of feet.

Sourcing the connectors may be as easy as the Grainger site. Speedo wasn't big enough(maybe) for custom plugs like that.