if anything, composing in reverse will improve your composition; learn to detach "composition" from "subject" and you may be on to something. just tonight, at AGO, an exhibition of 150 prints by Sudek, the curator never noticed that 3 were rotated 90 degrees on the wall--now that's composition, so obviously more important than the subject (which sudek, granted, never had, but that's another story). personally, i frequently flip the print upside down to judge composition...

anyway, all that assuming that by "composition" you don't mean the mechanical motion of training the camera onto the subject (in which case, apply b.i.d. for two weeks or until the symptoms recede)