Since this is for "things that go bump in the night" and other real world issues, then you need a setup that works when you pick it up.
Which in theory the Reflex II does nicely, however, with the various wash out issues, I passed on the Reflex myself.
With battery powered sight (i.e. Aimpoint or Eotech), would go with a good set of iron sights which you can use through the Aimpoint when you do not get time to turn on the red dot (I would even leave the rear iron sight in the up setting if the rifle is kept in a ready conditon).
One factor discussed in the past, is how well you can turn on the Aimpoint vs Eotech under pressure (second vote for twist a knob).
An initial idea is leaving the Aimpoint on all the time and changing the batteries every few months (no for sure is even an option as while a life of thousands of hours at the lowest setting of night vission is discussed, have not seen a chart of on time vs. brightness settings), however, appears a good way to end up with dead batteries.