Just install the tray continuous from point to point and use the tray as the EGC, you're done.
Didn't we have this argument earlier this year?
Once in a while you get shown the light
In the strangest of places if you look at it right. Robert Hunter
It would seem the EGC is as protective as the grounded conductor as all EGC eventually tie to the grounded conductor -- when installing multi circuits in a raceway we only are required to size the EGC according to the largest OCPD. Adding EGC for each branch circuit would not create a better path.. GEC are a different subject matter when discussing purpose.
CircuitRyder --- Unfortunately not all good ideas are code enforceable.
I support Bob's suggestion to actually work from real world situations that fail. Do a forensic analysis of the assembly, model it mathematically and demonstrate your case.
Another Al in Minnesota