I have tried the “Direct Addressable OSC” - works without problem but only in one direction.
And Yes: there are some problems when you link two widgets see link
When moving the expression pedal or a drawbar the widget did not follow correctly. The primary and secondary widget started to jump around for a few seconds but finally switched to a new value (not always the expected one). A bit like a spring witch needs a bit time to rest after you pushed it.
It happened only from time to time. Sometime it worked without problems. It also happened only to movable widget not to on/off switches.
Looks like there is no easy solution to combine 3 or more instances ?!?