Shortening the forum discussion and/or temperature check phases (phases 2 and 3) still leaves a minimum of 35 days; the on-chain proposal itself has no technical way of bypassing that.
Thus, AFAICT, there are essentially three possible ways to speed up the process further:
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Go forward with the on-chain proposal and in parallel find a large ETH holder to temporarily loan Defi United the ETH (to be paid back with the frozen ETH when it unlocks).
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Another Security Council Emergency action.
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A Security Council non-emergency action (minimum 18 days after action is initiated before funds are unfrozen).
I would personally be very strongly opposed to 2, as it would seem to me to violate the constitution (I don’t think the speed of the fund recovery can be classified as a security emergency) and IMO would set a very bad precedent.
I’m currently also opposed to 3 but would be more open to the discussion, though I would note that it’s not clear much time would be gained here, since presumably some sort of on-chain vote would still take place prior to the action (time gained would be 17 days minus the decided voting period.) I’d also note that this would still seem to me to be out of line with the constitution, which specifies this power should only be used for “routine software upgrades, routine maintenance and other parameter adjustments.”
1 would seem to be ideal if possible. It does of course require finding a lender, tho given the number of parties who have already been willing to not merely lend but donate ETH into this effort, it certainly doesn’t seem impossible.
(Note that I’m speaking only as a delegate and from my knowledge of Arbitrum’s governance system; I am unaware of any consideration or discussion of any of the above three possibilities that’s already taken place.)