Quote Originally Posted by D.U.P.A. View Post
They have quite different spell list.
True, but OP doesn't seem particularly attached to the spell list, or at least doesn't mention it. Nature Cleric and Lore Bard could/should pick up enough nature-themed spells to be able to pull off the vibe of the mentioned 'nature casters'.
So it seems to me worth asking whether the existing alternatives have been explored before embarking on homebrew. It might also be easier to homebrew using the nature cleric as a skeleton than the druid class.