I think the Elektron boxes are powder coated, at least they seem to be.
You should be able to use a laquer thinner on a rag on most powdercoats without damaging them. I don’t know what the base is for the printing though, so laquer thinner may not have any effect at all.
Curious? Why are you wanting to remove the logo? Could you just put electrical tape over it?
Yeah, silk screening can be removed but I wouldn’t recommend it. I think you have gotten some pretty good ideas to choose from. I say go for the stylefip option IMHO.