This is really exciting stuff. You're right, level 2 solutions on Hive are amazing thanks to custom JSON operations. Steem Engine is a level 2 solution that uses them to great effect as well. One feature which I build into my own library Hive Stream is the ability to do time-based actions (call code at a specific point in time in the future). To my knowledge, no blockchain (definitely not Ethereum) supports such a thing. If this was a proper level 2 solution offered by a team such as yourself, it would be amazing.