Konig & Meyer are the ones to take a look at first.
This electric-powered height adjustable keyboard stand offers pure comfort and is ergonomically optimized for making music while seated or standing. The keyboard stand is based on the…
www.k-m.de
$1500 USD at Sweetwater
plus
Keyboard and Laptop Holder Suitable for K&M Omega 18810 and Omega Pro 18820 keyboard stand, Height adjustable in 10 steps, 4-Way adjustable in depth, Can be tilted in 5 steps from 0° (horizontal) to 20°, 3/8" Thread connection, The top is also the...
www.thomann.de
That's some real Jordan Rudess type gear man.
I'm actually wondering about things like the venue, and how height adjustment is a requirement, much less Electric height adjustment.
I remember seeing Rick Wakeman's setup back around 1973 or so from a beautiful angle, slightly behind stage right and middle height in the Montreal Forum.
It was a motorized Rube Goldberg contraption if I'd ever seen one.
Customizable options must be out there, however, I'm somewhat dubious that that K&M stand's motor can hold up under the weight of two 88 hammer action keyboards???>?>
If the venue requires it, you can't afford to have it crap out mid performance.
Gary