How SE Can Fix SCH

[Zyneste]

I'm assuming a big part of the aetherflow out of battle thing was to put an end to high end SCHs needing to wait on Aetherflow to come back off CD for the pull. Personally I've never felt it was a problem given it was only a minute however this is admittedly pure conjecture on my part given the lack of feedback from SE on matters like this.

Your solution would work or a GCD spell with a decent cast (like 5 seconds) with: Gain III Aetheflow. Can only be used outside of combat, like old SSII.