If I have to move the hive 1 metre and also change the entrance orientation 180deg, would I need to put grass/branches to force the bees to reorient to the new entrance direction?
Personally, I don’t think the branches thing works, bees take their orientation cues from landmarks, once they leave the entrance and the branches they will see the same landmarks e.g. buildings, trees, hills, etc and return to the old hive position. I turn my hives 30 degrees at a time and have turned a couple of times in a day (morning and afternoon) with good results.
! agree with @Rodderick a metre move is no issue, you can do that in one move and I would agree that 30 degree of turn each 24 hours won’t cause an issue. so there will be no need for the bees to re-orientate. They might take a moment to figure out where the entrance is but they will find it.