After some long and complicated but friendly intervention and help exchanging configs and screenshots with another coincidentally Montreal Logic user through an iConnectivity support page and realizing their 'solution' was completely unrelated and they had even less of a handle on the Environment than I did.
In any case. I finally came up with a quick down & dirty perhaps not terribly elegant solution which is working surprisingly well for me -- though I realize I am probably still better off to try diving into the Environment as ATLAS007 kindly posted and shared above. Hey it's only been a few decades lol
In the meantime, I discovered I can enjoy all the benefits of iCONFIG routing and filtering and ALSO enjoy LOGIC recording MIDI in whichever designated device along with all my audio. That workaround is to simply plug in an additional MIDI interface not on the Mio10 DIN/USB chain and use the DIN inputs on them. When I use these new inputs not configured in the setup Logic has no problem reading and recording that information for me. This is particularly useful for me with a few external hardware machines conforming to the Producer Kits, but wow it would be sweet if it worked for everything simultaneously. Sigh.
Meanwhile, I haven't looked at )Ableton) LIVE but just today finally downloaded MAINSTAGE 3 - curious to see how it has evolved since the last time I looked at it (several years ago). thanks again to everybody for their help Eric and you DAVID especially THANKS this forum is/continues to be… such a fabulous resource …. as always