Hey there. Many folks have lives outside of the internet, so it may take some time for someone to respond.
I didn’t look at the link but you mentioned the MOTU, and I have the midi timepiece usb AV.
I have several midi devices all connected to the motu: a rev 2 16 voice, Jupiter 80, ob6, tr-08, tr-09, d-05, mpc X, DAT machine synced to word clock off the motu, fostex 56 track SSD recorder synced to word clock off the motu.
The Jupiter 80 is the main contoller, and with pre-set basecamps, i can route any keyboard to anything else or sync certain items to certain things.
In your case, you want to use the mmt8 to sequence, so setup a specific preset to just connect those two together. Its simple but each setup is unique to the end user.
But if you are asking if there will be any issues with setups like this, the answer is no. Ive had this setup for quite a while.