I haven't tried the curiosity board yet so I don't know how the ICSP connector fits into the picture.

making mplabx pkob the only programmer that works
There's an mplabx command-line tool 'ipecmd.exe' supposedly similar to 'pk3cmd.exe' that sounds like it should work with any of the programmers,
and it has a PKOB setting. There's a readme in the docs folder. Might be worth trying that w/the curiosity.