Yes, Zee's will work with the rail.
Most scopes you will find will find will have enough adjustment to zero at 100 yards with a 20moa base.
Yes, you'd also be able to use the inserts to take some or all of the taper out.
As for the cheek weld. The only problem I see is that they are a fairly high combination. Go to lower rings or a lower base. Or, add an adjustable cheek piece.
For lower bases, I like Burris Xtreme bases with the Signature Zee's. If you wanted to keep the EGW, I like the Burris Xtreme rings. Either way you'll be able to keep some taper to reach out for those long shots.
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