I've replaced mine a couple of times with normal grips. Actually, I used foam grips. Yes, that insulates them a bit, but I like the comfort.
BUT, you have to realize that the LEFT grip is also on a tube, like the throttle grip. So you have to buy TWO sets, throw away the normal left 7/8 inch grip, and use the two 1 inch throttle grips.
Use care when removing the old, and installing the new ones. The foil heater under the grip is likely fragile.