Wayne, I hope you have an endless supply of ice. Also, you may be making this a little more difficult then it needs to be. At the low pressure you stated, the beer will barely dribble out of the faucet.
Apply the 30-35 and if you have the keg iced down, simply vent the headspace back to a lower pressure at the end of the day. Next morning simply adjust back up to operating pressure.
Scott Zuhse, Instructor
Micro Matic Dispense Institute