I really want to fly Major Vermile (Krennic crew) with Carnor Jax. What do you guys think the other ace should be? And other reaper crew?

need to wait for previews to even know the thing's dial and Ailerons

unless you want some future-reference jank, in which case there's LW Major Vermile with Kallus + LWF

you're kinda LW Asajj against a specific target, you're just swapping out guaranteed evades for Jam + guaranteed hit via Vermile's ability (though you could always just evade)