Yes, the 22HD will work with an LX monitor arm
: it's weight is just under the maximum allowed for the LX and it includes a 100x100mm VESA hole pattern. In the Cintiq User's Manual, on page 91 it describes how to attach an alternate mount: basically you remove the Cintiq's pedestal stand and then relocate the cables exiting from back of the display. It looks like there is a cable channel that can be used to route cords below the VESA attachment interface. Next, attach the LX with fasteners from display.