I think that is a good idea.....I would see if Lakland has any ebony fretless necks in stock......that way:
1) you don't do any damage to the nice rosewood (which I think defretting it would do)
2) you can always convert it back if you want to sell it or just want to go back....
another option would be to see i they have any of the maple fretless necks left.....
woah woah woah... pump the brakes here... lakland has fretless MAPLE necks?!?

