Well, Koten was made completely from scratch, but it's completely compatible with older versions of Zelda Classic! I think it would work just fine for this, and if you need more 2.5 features (proper item triggers and blocks) I actually already have a ton finished up. Also, I know it works just fine because Quest of Lamba II uses it: http://www.purezc.net/index.php?page=quests&id=482