Hi Bruno,
I am having the same "problem", but I'm not so deep into the whole soldering stuff yet (basically I don't quite get your blueprint:), could you explain a little in depth or show a picture? This would be great! I want to send MIDI PC to the Polymoon via my Switcher, going into a MIDI quadra through and then to different pedals, but since the polymoon is the only pedal I have that needs MIDI via jack input, I don't want to spend 65 bucks for a midibox that has four outputs...
Would be awesome if you could help!!:)