Got the Primo Comets and brake pads installed this evening. Pictures to follow once I get everything swapped out.
Also, I found this imitation of a LitePro P-series front derailleur adapter on ebay. I contacted the seller and they claim it is 41mm ID, which is the diameter of the "derailleur tube" on my folding bike (same tube size as Dahon Mu, I believe). I just ordered one. ThorUSA lists their LitePro adapter as out of stock. But I like the fact that this generic one is not hinged, but rather has two mount bolts. I think this will allow a little more wiggle room for mounting (and filing if required)....
Aluminium Alloy Braze on Front Derailleur Clamp Adapter for Folding Bike | eBay
Hopefully it will work out; this will enable me to upgrade to 12 speed! :-)