I had hoped someone who grows more Rexes than I do would answer you, but I think you've waited long enough! It is possible, tho' a bit tricky, to cut them off and root them. (That's almost always the way to cure any leggy plant, and even if the cuttings don't root, new growth will start at the base and on the stem if you don't cut it all the way back, which might be a good idea.) Might be best to wait a few months to do that--plants really respond to the promise of spring. Some folks recommend just laying the cut stems of Rexes on top of the soil, rather than pushing them into the mix, as they have a tendency to rot easily. It's supposed to be easier to root leaves than stem cuttings, tho' I've had pretty equal success. Just very important not to water too much (or too little, my weakness!) and I think long-fibered sphagnum moss really helps, either straight or mixed with approximately equal parts of perlite.