I’ve tried and I’ve not been able to on the Mac.
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Move to cell to copy from. Command-C to copy.
 - 
Enter to stop the marching migraine ants.
 - 
Move to cell to copy to. Command-V to paste does nothing.
 
      
    I’ve tried and I’ve not been able to on the Mac.
Move to cell to copy from. Command-C to copy.
Enter to stop the marching migraine ants.
Move to cell to copy to. Command-V to paste does nothing.
You could try to skip step 2.
Esc after Copy will stop the marquee without dumping the clipboard, If that’s the goal.