Because the frame IS the firearm as far as the serial number is concerned I think you're going to run into some issues here.
I did ship my 23 back to Glock for a new frame because my frame old broke and had to be replaced. The old frame was destroyed, the gun shipped back to me with the old slide and barrel under the NEW SERIAL number as I understand it.
You might be better off purchasing a new gun and selling the old. Just an opinion.