Rick...I'm with you on this one. I also had a Grandma who bought nice new couches and chairs and thought plastics on the furniture is a good idea. The first cue I had was a Meucci Originals European plain jane and I liked it early on or at least until I tried a friends custom with an exposed linen wrap. Ever since then I can't picture heading back in that direction again.
Scotch guard sounds like a better idea than putting a finish on it. Never did that, does it affect how the linen feels in your hand?
If you want a white handle on a cue you can always get the handle replaced with a nice holly dowel and get finish over that. Another thing I saw recently that might hold up well too if you like leather is a white leather wrap. There's a guy on here that goes by jazznpool that carries them in his online store
www.superiorcues.com . I think that might be easier to keep clean.
There is always the option of getting it cleaned and pressed when it gets bad or wrapped again with some fresh stuff later on.