Okay. So, an obvious problem with my idea of dropping the boot support.We're missing the rogue program as well as the stomping boots. The rogue program because it drops a coinmaster token rather than the spleen itself, and the stomping boots as they don't "drop" any items, they provide the use of a skill which then gives the items. So regardless of what we do with the other 5 familiars, we need to keep overrides in for those two.
Three options:
Overrides first, only include overrides. This means that the rogue program and pair of stomping boots gets used for anyone who has them in-run, and the newest spleen familiars gets used otherwise. People can always add more override familiars to set their favourites.
Overrides first, keep the current list. This means that the new code gets ignored until a new familiar gets added, but people won't end up using the stomping boots by default if they have something else. They can resort the list or put in their favourites in a different order as well.
Overrides last, only include overrides. This means that the rogue program and pair of stomping boots only get used when you don't have something newer, but you can't manually sort the list if you prefer Groose over Monkey for some reason.
Since both of the override familiars are out of season now, I'd be tempted to just go with the first option. If people want to set a fav familiar, they can always just add them to the short list of two.