Got feedback from support who agrees - not doable.

So here is plan B - I will let you know.

LoopBe1
A Free Virtual MIDI Driver
LoopBe1 is an internal MIDI device for transferring MIDI data between computer programs. Basically LoopBe1 is an "invisible cable" to connect a MIDI outport of an application to any other application´s MIDI inport.
All MIDI data sent to the program´s output is channeled to the receiving applications in realtime.
You may connect up to 1 applications to LoopBe1's inport and up to 1 applications to the outport.

LoopBe1 is a native Windows™ 2k/XP/Vista/7 WDM kernel mode driver, so expect the lowest possible latency.

A System Tray Icon to Mute MIDI
LoopBe1 comes with a Systray Icon. You can switch it on and off like a hardware device and view its status.

MIDI Feedback - Shortcut Detection
Think of an application opening in- and outport of LoopBe1 and connecting both ports via MIDI through: you would get an infinite loop of MIDI data, circling in realtime, which would seriously slow down the whole computer. As modern MIDI applications may open several ports, this happens all too easily.
LoopBe1 has a powerful shortcut detection to avoid MIDI feedback. If a feedback is detected, LoopBe1 will immediately mute its port, interrupt the loop and popup a message. After disabling the malicious MIDI through within your program you can easily enable LoopBe1 again at its systray icon.
LoopBe1 Is Free
Download it now. LoopBe1 is free for non-commercial, personal use only. Any commercial use beyond a 30-day evaluation period requires purchase of a commercial use license. Please visit our order page.

Dan, BIAB2024, SoundCloud Win11, i7(12thGen), 32GB, 1TB SSD(M.2 NVMe SSD), 2TB Libraries, 1 TB(WD-Black), 2TB SSD(M.2 NVMe SSD)Data, Motu Audio Express, Keystation 61, SL88 Studio, Reaper