Digitakt and Digitone MIDI Channels Help

Hi all. I’m trying to figure out a simple way to do the following.

I want to use my newly aquired Digitone to play the four synth parts on my SH-4d as its MIDI tracks have 8 note polyphony.

I want my Digitakt to play the SH-4d drum part and my JT-4000M with its MIDI tracks.

I also want my Digitakt to act as the master and send programme change messages to the Digitone when I change patterns so they change at the same time.

I dont mind buying a MIDI box to make it work as long as it isnt too big or expensive. I have a CME MIDI Thru5 WC 1-in-5-out MIDI Interface I used when my Digitakt was my sole controller.

Can anyone think of a way to do all this? Thanks!