I normally would have voted to keep the original scales, but if it were mine the scrawls would drive me nuts. What a shame that someone had to deface this knife. Hopefully it was a child who didn't know better. Anyway, I'd have to replace these scales, but I'd look for a set that didn't have the scale tools to keep the original Standard look as much as possible.
Side thought: shouldn't this knife have a grooved corkscrew?
Good luck with whatever you decide.