I think you've got the right approach to manage burnout and look to be setting things up so that HA has the best chance to be long term sustainable and prosperous.

The role or title is a tricky one, even a bit of a wanky topic to dwell on, but it'll be important for the community to have some idea of your mandate. I was never comfortable with "El Presidente" because it implied strong executive (even dictatorial) power which I fundamentally don't agree with. In a crypto-based community promoting decentralisation I found it to be totally innappropriate, but maybe that's just me :)

Chief Organiser sounds good to me. It's about facilitation, co-ordination and caretaking among members. If @ausbitbank is the only one holding the owner key then the Custodian role would be for him. I would suggest that the Chief Organiser role should hold the active key as insurance against the "Custodian gets hit by a bus" scenario (or equivalent) which would in all likelihood "brick" the account if others are only ever given the posting key.