Canyon’s commuter line has a couple belt drive options like the Canyon Commuter 6.
I have also heard some good things about the Spot Acme.
Gates also has a searchable list of their official partners to find others Gates Carbon Belt Drive - Bike Finder.
I have a Priority Ace that is my winter commuter and I gotta say, Priority’s customer service has been absolutely top notch for me.
👆This. It’s not going to affect this particular bike’s value too much in either direction. If you think the paint prep is worth the effort then go for it!
From a practical standpoint, you might want to consider at least cleaning up any exposed steel and applying a little clear coat.