Not what you want, but this may save you a day or two.
Big pic >>> https://i.imgur.com/82CkbgB.png
-- in the 1x8 switch, the input (effectively from a MIDI Note On) is switched between outputs 1, 2 and 3,
-- output 1 starts the first Sequencer and stops the second,
-- output 1 stops the first Sequencer and starts the second,
-- output 3 stops them both.
If you change the number of steps to 2, then each MIDI Note will switch to the other Sequencer.
The preset is attached, put it in a sub-folder in your User Presets folder (C:\Users\DarkStar\AppData\Roaming\Voltage\Presets\User Presets here).