IOW, while I run crontab -e on bookworm, inside my emacs session,
I want a subshell to run crontab -l, but the latter has to run on
bullseye in order to pick up the old crontab. I'm not sure how
I would do that.

Try running :
ssh user@bullseye crontab -l

It will locally list the crontab from remote user "user".

Note I've never used emacs, so dunno if ssh is allowed !

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