If your wife is like mine (and in some ways, she sounds like she is), then appearances are very important to her. We all draw the line in a different place, and while YOU may think that this is "no difference," my bet is that SHE will be upset by it, and it might jar her into some action or at least some meaningful conversation with you about the state of your marriage.
Like everyone else here has said: What HAVE you got to lose?
I wouldn't do the hotel thing -- just sleep on the couch. Leave your blanket and pillow there for all to see that "things are not 'right' in the CeMar household."
