You're welcome
If you read the MIDI documentation for the Kemper (a small doc is d\l'able from the main site) you'll be soon aware of what MIDI messages you'd need in order to manage your Performances. Pretty sure it's perfectly doable with any MIDI board
Remember you'll at least need an HD500 in order to get the best of the two worlds (for example having the two outputs from the Variax processed in parallel)