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I went ahead and reformatted an HFS+ partition as APFS. I did run into a problem when Disk Utility could not unmount the disk. Unfortunately, I do not understand the meaning of the error message:
The volume couldn't be unmounted because it is in use by process 86 (fseventsd)
So I tried reformatting the volume as HFS+ and that was successful. Then I formatted it again as APFS and it worked.
I used SuperDuper to copy the internal Mac SSD to the new APFS volume and that went without a hitch.
Thanks for your help.
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