I pitched removing leprechauns with Garden of Kharid because they're a mainstay in my nightmares, (and replace with better-looking druids) but it didn't go down well internally.
'theyre iconic'
Why don't you graphically rework them instead?
It's (in my opinion) just not a good use of resources, we could do up a monster / armor remaster / anything else pretty much and have more impact than leprechauns would.