To find out yourself probs need Cricket Archive and you've got to pay for that.
Maybe worth asking on reddit cricket forum, loads of stattos on there that probably can work it out.
For free ones Howstat I find is a better database for having a look than Cricinfo to try and get the answer. Lot of googling to try and nail it down.
Here is the two closest to 1000 FC wickets amongst active players though
980 wickets
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954 wickets
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So if Harmer had actually committed to England he'd be second on your list after Jimmy.