This seems like a great proposal and a cool way to deepen the partnership between Aura, Balancer and Arbitrum.
A few comments/questions:
Is there really a need to farm BAL/AURA and sell some for ARB with the treasury. This seems to just dilute rewards for stakers. I would prefer if the treasury/this contract did not stake BPTs and hence there should be no BAL or AURA.
Do you mean the ability for each DAO to withdraw the tokens they put in?
It would be easier to manage if we could vote on a single pool mixture and stick to it.