Hi and welcome to mightyram. You have been pretty busy resurrecting your Ram 50. It would be easy enough to bypass the faulty headlight switch but there are alternatives. I found this - https://www.ebay.com/itm/32435143505...0AAOSwGYZfl8tf

It's listed as a replacement part for Mitsubishi L200 (LHD) which is the same vehicle and there are a bunch of other listings once you start following the recommendations on eBay. It 'looks' like it's the right part but you'd need to check out the listing first. The Standard aftermarket part is hard to track down and I saw some steep prices on it (if it is even available/in stock)
Hopefully this is a win for you