Can you guys let me know if this is right.  I have a Crye NightCap and am looking at buying an AKA2 mount that has the dovetail hookup.  

Is this and this my only two options for mounting this to a PVS-14?

I'm guessing by looking at it, but on the dual one, I could take off one of the dovetails to make it a single, right?  I have no use for double.

Currently I am using a J-arm with a rhino mount, but it doesn't have the dovetail mount.

Yeah, go with the DDA, the horizontal adjustment is essential & that extra dovetail is to quick-switch eyes when the 14 bores a hole into your brain after a few hours of use It doesn't get the optic perfectly over the other eye, but it gets you close enough.

Oh, there have also been reports of Wilcox & Norotos stuff not playing well together. I think it was the other way around though, with a DDA not fitting some G24's or something. Does anyone remember or have experience with that combo?

If you don't feel the compelling need to get dovetail, you could just get an AKA2 with bayonet interface and use your existing J-arm.  That is the exact setup I run on my NightCap by choice, and I have the AKA2 dovetail adapter and DDA in my spare parts box.