Have you considered a keyless entry kit. That is the route I am taking on my ‘55 chrysler something like this kit.
https://www.ebay.com/itm/Universal-Power-Central-Lock-Kit-Car-Remote-Control-Conversion-Keyless-Entry-Set/322960452243?hash=item4b31f16a93:g:ahwAAOSwzRlaQkR1


Keep your Mopar all Mopar