Worth it? Very subjective. With NV, you can't go cheap unfortunately.
Duel tubes if you can swing it. About $5K would get you a starter pair that is very nice. $8k to $10k a very nice set.
I prefer duels or a PVS-7 ( I know) over a PVS-14 single. The depth perception and naked eye both...
I wouldn't try to to Co-witness, the iron sights are super lower.
And any dot that could co-witness I feel like with be to small and the front sight would take up most of the view.
I prefer MRO on most of mine...