I'd get some shifters personally. (In order of decreasing likelihood they could fit on your bike) Friction barends. Stem shifter. Clamp-on downtube shifters.
Originally Posted by
Shuke
If I took the rear derailleur out completely could I buy a new chain and then install it so I could use a different gear combination??
Quite possibly. You'd have to hit a "magic ratio" that also has a decent chain line.