I understand what you want to do Bill. Lower revs to reduce stress on the motor. You could take off a tooth or two but really it's usually not a good idea because usually it increases stress on the motor. It'll be a bit like asking the engine to go uphill all the time.
Modern motors like to rev, they are designed that way, well most are especially the smaller ones. They all have short stroke low piston speed motors. My GTS revs high but the motor is not stressed at 70mph because the piston speed is low. If I lowered the engine revs the lower revs would bring the piston speed down increasing the bmep (pressure in the cylinder) for any given speed compared to the original gearing. In short it's normally best to let her rev as she'll be less stressed. Could go in to lots of technical stuff Bill but my surgeon has just walked in, I'm going down!!