I got this at a Tommy E workshop. While the signature is more or less out of the way I'd like to see it more permanently preserved since I have no intention of selling this guitar and no intention of not playing it (it is my only 6 string acoustic and of incalcuable sentimental value). I asked a local luthier and he quoted $60-90 (depending on location he did not see this image). Is there a cheaper way I can do myself? Will I risk messing up the sig if I do (the signature is with a black sharpie)?