ah OK!
i thought you were controlling your HW Synths, effects etc..
my suggestion was put multiple instances into one track and define the track HW output to desired device/port and control your synths ..
since all controls are (CC & channel selectors) visible all the time (JSFX i mean)
i assumed might be a little easy to setup for you..
anyway,
now i think i get your point!
&
i would love to see in action that setup
especially the Playtime how you integrate & use it.. what is the benefits etc..
because i believe you can do similar things with the Take Switchers.