I've made a little progress and have a couple of more questions. The current drop bars measured 25.4 mm (it had a thin sleeve on it). The quill stem measured 22mm +. If I am understanding all of the comments, I should be able to use a set of flat bars (or curved bars) from the co-op that measures 25.4 in the middle and a set of levers off an older MB that has a short pull. Could I also get a stem adaptor, and use the handlebars that were donated from a local bike store? These are take-offs from ebikes that are being replaced an on a particular model since the people buying the bikes are requesting swept bars. Here is a link to the adaptor.
Amazon.com : UPANBIKE Road Mountain Bike Bicycle Stem Riser Adapter 1 1/8" φ22.2mm 25.4mm 150mm : Sports & Outdoors
Is one of these ideas better than the other? I've included a pic of the donated bars and the current stem.
