first, it is 10lb 2oz. not 10 1/2 pounds... folks will get a bit persnickety about those extra 6 ounces.
second... as long as your rifle fits the configuration rules for the hunter class, your strategy will work.
third.... most folks shoot scores with their 8 1/2lb hunter rifle at or near their standard rifle scores without the extra weight.
to the best of my knowledge, i don't know anyone that does what you suggest.
dave imas