Mix (real) Mayonnaise 50% with Ketchup 50% or go 1/3-2/3 or 2/3-1/3 if preferred and dunk your crispy onion rings in that. A pinch of onion powder and/or paprika won’t hurt either.
Enjoy!!!
Also works well on crispy fries; I prefer crinkle-cut.
Goodness ... I think you are trying to outdo the Canadians with their poutine. ;)