How big is the hole! Sometimes to aid re-wiring, I cut strategically placed 80mm dia. holes is ground floor ceilings. I save the cut outs & just stick them back in after the re-wire using grab adhesive all around the edge. It will work fine as long as the hole is not too big & the PB infill is not too large & heavy. You only need to hold it in place until it grabs & then it will support itself until the adhesive goes off. I then apply reinforcing tape around the join prior to skimming. I use the same method when moving pull switches or to repair other holes.
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