I'd convert it to a euro torch. Looks to be easy enough. the trigger wires are there, so that would be straigh forward. the power lead would attach to the connector and then be routed out the front of the box to the terminals. It even looks like it has an internal gas solenoid too. The Wiring diagram is here
so you will need to mount the euro connector on the box. the neck will need to just reah the rollers, not too bigger gap.
connect the gas tube to the connector.
connect he trigger wires to the connector.
connect the power cable to the connector and route it to the terminals.
that should keep you occupied for an afternoon
will be having a look at the weekend, may take axtra photos and strip back some wiring, cleaned contacts again today as i needed to use it, managed ok but needs new life breathing into it
cheers for diagram