To add no one seems to have a definitive answer on how quickly the BB repopulates to rehome a given item (substrate, filter part, new plants....). The substrate is a big area so getting rid of a big area like asteroid said will have a impact. That being said you dont have fish in there, you have a filter to essentially seed with, and whatever plants and objects you take out and put back in as long as they stay wet should maintain the BB you currently have.
IMHO I would just do it now, get it to like you want and deal with maybe having a little extra time doing your cycle. Thats just me however, sure there are plenty that will disagree with my thoughts on it.
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