For the bar-end shifters, I recommend picking up a pair of Suntour Barcons. They are not indexed so they can be used with any derailleur/cassette setup. They have a ratcheting feature when you pull the cable to get a bit of overtravel for shifting, then settling down into a good spot. For relaxing the cable, they are pure friction. I've got them on two bikes and they work fine. You have to pick them up used; they haven't been made for years. I would check the Classic & Vintage For Sale listings and eBay. Expect to pay $30-60 for a pair of shifters.
EBay listings.