This is my method, partially. It takes approximately 10 days to become fully rested, if logging out in an inn. I have found a couple of inns that are bugged and don't give the proper amount of rested even though you get the instant log out, but most inns work that way.
However, this leaves you gaining only a level and a half every ten days, and thus would take about two years to fully level cap a character. I try to push them further when possible.
Unlike the OP, I have multiple accounts, but I do have 50 at 90. My goal for WoD is 100 at 100.