The EL buttons are a waste of time and effort mate, if you want cruise on the territory just buy the switches from a same era Falcon or territory, they fit straight on more or less.
If what you're suggesting is to somehow integrate the EL switches into the Territory and get a sparky to make them work, it will cost more and look rediculous than just sourcing the correct switches, thats if it could be done anyway.
This is all you'll need..
https://www.ebay.com.au/itm/FORD-BA-...SbMd:rk:2:pf:0