actually this is much simpler than you think. You don't need to program the system wet/dry per every single preset. Once a MIDI CC is patched to the system wet/dry balance, you simply need to send the desired value, along with the MIDI Prog. Changes you need to switch to different presets. You may also have 3 switches pre_programmed to set wet/dry to 50/50 – 25/75 – 100/0 and make your choice. It's all about the versatility of your MIDI controller.
The H7600 and H8000FW won't be different in this regard BUT the H8000FW, being based on routings, allows to route input(s) and wet signal to the same output. By remoting the I>O signal path level, you'd achieve the same goal.