You should be able to buy several 3-inch Detective Specials with the proceeds of the sale of the nickel 2-inch with apparently factory pearl stocks. Because it is your gun, you can crush the gun or paint it pink, or even put a 3-inch barrel on it, but that does not make economic sense. The gun has high market value as is, and little market value once modified.
Sell it and buy as many 3-inch guns as the proceeds will cover. Later guns are better metallurgically (sp?) anyway.
(Apologies to anyone offended by my "delivery.")