Wormbo Oh, here's a random idea that may or may not suck: To obtain Botania-related pottery sherds, what if there was a very small chance the Clayconia turned sand into suspicious sand with a clay-related loot table that included some of those sherds?
Probably not great for automation, since suspicious sand would just sit there and clog up the system. Maybe with another, also small chance (so it's less likely the sus sand is consumed before a player gets a chance to deal with it) the Clayconia could treat it like regular sand to convert into clay.
Also, considering the change for Drum of the Gathering to obtain suspicious stew from brown mooshrooms that have been fed a flower, how about letting the Pollidisiac feed them flowers for that purpose?