Frank, slap some new cables on that bike, or new sleeves or whatever you call the outer housing. New cables should be easily replaced by any competent bike shop and other than selling bikes for Christmas they probably would appreciate the work and not charge a fortune. I had new cables fitted to my bike when changing the gear shifting mechanism, Trek Crosstrek, from the grip shift to trigger shift. It was not very expensive.
Especially if you are going to continue riding it this winter. There is a grizzly bear like Canadian rider on the CX forum who has a winter bike (CX) of course that is fitted with a side car and he rides year round. I think the side car hack is predominately a winter transport or possibly a bad weather bike. He uses a good fairing with lowers and relocated the radiator to provide heat for both himself and the side car.
I will have to send you a link to the thread where he did a refresh, reengineering on the bike cosmetically, etc.