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No, you'd then be fighting the pump and hydraulic pressure...which is way worse than a regular depower.
Drain the fluid, or do it the FM way and be really happy. I just cut and capped the metal lines after turning it both ways a few times to remove all fluid.
Don't forget to adjust the rack slack bolt when you do the FM depower too, I fought against the hard steering for over a year before I figured out I was supposed to back the thing out a bit.