Efficiently, no; for me qcube-gray is all about minimizing the trial and error you have to do. For instance, I generally prefer to solve one piece at a time (well, more in the case of centers) directly. It's often useful to only know one sticker of something; for instance if the first layer of 3x3 is solved, and an edge matches F but not U, you know you can insert it in FL or FR. The same idea applies to stuff like "F4L" stuff in K4 etc. And for the first layer, you can use F/F2/F' moves to test if something belongs there or not, before actually trying to insert it.