you can change your floors without too much disturbance to the bees, yes too early to check brood, let em get on with it, pollen coming in leave well alone, keep calm, dont panic mr mannering!!
air bubbles created by creaming, just eat it yourself sounds fine to me, rare for osr to be fermenting, if fermenting it would have pushed the lids off
A WHAT!!!!!!! why have they swarmed so early? 2 queens or more, brood box full of brood or stores, its not normal surely as they wouldn't survive in the nature as theres not enough out there for food and pollen and are there enough new bees to build the wax required for a new home?
dont worry about inspecting the frames just ensure the bees are near the stores or food source if not sure get some fondant right on top of the cluster and wait until the temp is about 16 or more. nothing else you can do
we built an 8 x 8 room, adequate, 2 stacks of supers = 20 supers, into uncapping tank. into spinner, honey into honey tank, supers when done out of way. got 60 hives going no probs.