Thx again Martin! We are, to a great extent, already there. If I can insert a Midisport 2X 2 (so don't have to use Rack) but still do same thing utilizing my 8×8 (when using rack), I've covered both situations. So, really, with the addition of midi merge box, we've answered my OP. I was looking for a solution with no box. But, having seen that the midisolutions box requires no power (another issue for me since I have 3 x PP2+ all full up), that will work.
Taking it to the next level: GCP providing tempo for multiple devices, is a new challenge. How to turn cc to clock… I believe I have devices that will do this. I think all my Line 6 Pro modelers do this. But, I'll have to take a look. I believe we've just confirmed that TF/ MF do this, right? I think Eclipse may do this, doesn't it? I'll have to do some investigation. There must be a way. If I could have one tap tempo source providing CC tempo/ clock to all devices I'd be a happy camper (and I'd be dancing a lot less!). I'm a fool for delays. So, I have a bunch. Now, if only I could figure a way to get clock to my vintage DMMs!