Schamass’s solution would also allow you to have patch persist, or overlapping midi/sound functionality without having to add scripting to achieve that which given your style of play would probably be an asset.
This is very similar to how I set up my system and I use Global Rackspace downstream of my local rackspaces to control mix and global effects like Leslie making it the last stop in the signal chain.
Since you have only VST sound sources you’d have no issues switching between sounds/rackspaces without interruption.