In my experience, Demaree tops will only start/complete a few queen cells from scratch no matter how you introduce the larvae (Miller, graft, cupkit etc ). However they can usualy be relied upon to finish up to 10 cells if started elsewhere (swarm box, dequeened colony) and transferred after a day or so. I usually put two frames each with two bars of 10 cells into the starter and then once started transfer one bar into each of 4 Demaree tops. I have been using such a method for many years fairly successfully. I have also found the Cloake board a good method to start and finish up to 20 cells. Like all things you need to get the timings and conditions right eg in a dearth you need to feed other wise they eat the larvae and bite the cells back. Also important to have plenty of young workers present as well as a comb of pollen next to the frame of grafted / cupkit cells