Disposable doesn't mean you have to throw it. I still use the same disposable gloves since the beginning of cold weather. Except if you intend to clean while riding i don't see the reason why you should throw it. But for that the gloves will have to be thick enough. The best will be the disposable gloves used for cleaning or washing dishes but for fashion purpose you will probably want to put something above.
Those gloves create a little vapor barrier which is the best ratio warm/thickness you can get on the market. I have polar expedition mitts which use the vapor barrier technique and those are warm even at -20C. I don't know any mitts from popular brands able to sustain a 2hr trip on bicycle at -20C with just one layer above naked hands. The feeling i have when i put these on outside in below freezing temperatures is like when you put your hands close to a oven. The heat is in fact my own heat reflected by the mitts to my skin