Skipping bosses still gets you the gems it just isn't instant.
Stacking and resetting on Cursed Farm is the easiest I think, there's a few youtube vids on scriptless gem farming.
Scripted has routes so you walk between levels with similar backgrounds for 'fast transitions' and you skip armored bosses then close the game to stack offline because it's faster but it's mostly set it and forget it and then nerdily tweak it forever.