Interesting setup. I'm in a similar situation, as I do all my mod and dirt on the board, but wanna use a rack unit (KorgDL8000R) along with it. But that board with the rack in diagonal, it must be a pita to carry around I suppose?
Maybe I'll just stick with my DD-2 and H9 for now.
Indeed, an analog mixer always sounds better than a digital like in most delay units.
I was considering to get a Switchblade 8F to do switching, mixing and control levels, but maybe it's overkill.
I am a bit skeptical with the Gigrig stuff, as it's a bit weird not using midi etc ..