At one time when I was using a pair of Bartettas I sat the speakers on each end of the Rock And Roller cart, then sat the keyboard on blocks of foam atop the speakers. The foam was to protect the keyboard from the speaker vibration. Same kind of situation - two jobs in the same building. It worked great.
Good looking rig, Deane,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)