yes, it could be an alternative, and a leather grip is about 0.2 oz heavier than a normal replacement grip. i think babolat's or volkl's are the heaviest of the bunch. fairways are best if you can still find them (TW has them in a navy blue color)
I recently replaced the plastic grip on my racquet with a Babolat leather grip. The original grip weighed 15 grams while the Babolat leather grip weighed 29 grams. I have a bunch of Fairway grips and a couple of Pro Kennex leather grips that I have not weighed yet but I suspect both are significantly heavier than the standard grips the vast majority of racquets come with.
Well... I dont think leather grips would look good on my racquet so as far as the feel and texture of the grip I dont care because i will be using a overgrip but I just want one for the extra weight...
The Wilson leather grips felt firm, much like a fairway or a volkl imo. Like you, I don't use a bare leather grip because it would just fly out of my hand, but instead opt for one Wilson pro overgrip.