You'd use the trapping for maneuvers and blocks that express the pressure your will puts on people.
You can grapple with Incite Effect if you buy the appropriate upgrade, incidentally.
A -1 Power that lets you grapple with Conviction, without the need for an invoked Aspect, sounds right. I mean, there's already a Stunt for Blocking, but Grappling is different (and much more like what the power does) and sounds good for this.
Nah, you should still need the Aspect invoke. Removing that requirement is pretty similar to granting an extra action, and shouldn't be that easy.
Also, said grapples shouldn't have any range. Because basic Might grapples don't, and for 1 Refresh you can't do much more transplant trappings.
Would probably be fair to let people inflict mental stress, though, which is actually kind of a big deal sometimes.