If an EO was issued that was not technically an outright AWB, but a set of very restrictive regulations would there be enough people motivated to challenge it?
An executive order can't be used to create regulations. That would be a blatantly unconstitutional use of a power that's only implied by the Constitution in the first place. Presidents know this, and even if they were tempted, they've got a cadre of advisors who'd counsel them against abusing it.
That's kind of the point of this thread.