I thought I should add some idea or feedback to this sugguestion.
From a developpers point of view, there is an easy solution to this. Either you just don't allow it or you only allow it if there is a new set of nanitic tiles. Which would mean that you first have to place a new slot of nanitics and then be able to remove the original slots. This could be interesting for a moving option for the queen.
But how to obviously avoid people using this to just move the queen around a bunch hidding her each time cheating the game etc.
Well the next rule could be that first in order to remove A you need to have B. Second B cannot spawn any workers unless you tell the queen to move to B.
But what now? You have now 14 slots for cheap nanitics.
Here you set a limit of 7 nanitics. So the eggs cannot be placed until one of the eggs on the other slot have hatched or unless A was completely removed.
I guess this might bring some bugs that may or may not be easy to fix or a pain in the ass. But it might be something to think about or look into.
Actually thinking about this a little further I already see a sugguestion for my own.