Quite a few were PFC, so he will be back soon to do the same.
Annoying for him, and I prefer exp spam

How about /altrefresh or something like that? Based on the same list as /ipplayer.
It refreshes the alts the same way as it is done by logging them in.
From 1 char, for all alts.
Most abandoned chars will still be deleted. Maybe a few unwanted/not needed alts stay alive this way.
/altdelete <name> might be an addition to solve that, but I doubt it is needed.