Yes, we do not make it easy for collectors.
Opinion:
only solution is using "Bestine" (Bunnings Un-do) $14 a bottle.
Invest in a set of PRINZ long pointy nose tweezers .
Remove the lip attachment from the bottle.
Turn the stamp over, and drip some solution on the back of the stamp,
slip a blade of the tweezer between paper and stamp, slip off the shard of paper, place the stamp face up on neutral talcum powder.
With practice takes a few seconds.
If that is beyond you, just cut around the simulated perfs, leaving about 3mm border.
Good Luck.
Result:
