A bit late to the party but are you in a sense simply trying to have both spot and tracking available at the press of a button without having to go into the menus and change stuff on the fly? Because the way I set up my canon bodies is the following:
-Disable shutter button focus
-Leave AF-on to spot focus
-Remap the * button from exposure lock to AF function recall, where I add AF start, tracking on, Eye AF and specify the subject I want to track
That way I just have to moe my thumb one button right or left to engage tracking or spot.
Hope that helps,
Felix
@fbimages thats how i do it too, but i was hoping to set the position in the frame using the tracking af, but then hold on to that same position when shifting to spof af. It jumps back to the center when released rather than holding position.