I appreciate the suggestions. Can't afford another set of wheels at the moment, maybe next year, an ebike would be cheating (sorry) but fun for sure. The only non-studded snow specific tire I could find was the Continental Top Contact Winter, which unfortunately appears to be too big for my 520. Schwalbe GT 365 looks like it might be a safer alternative to my slicks and unless I find something like the COnti's that will fit, I will probably pick up the GT365's or the cheaper Schwalbe winters and put in the extra work.