I have an ARMS #2. Not sure if you can still buy them, but it works very well for what you want it to do.
You don't NEED a cheek riser. I have done some shooting with a scope on a carry handle. On my A2 and even my (gasp) removable carry handle on my M4. For me, it's not that bad of a deal. The downside to a traditional scope is depending on the eye relief, sometimes it will put the scope kind of far back and you may be too close to the scope if you're like prone. I had this issue with my Leupy 2x7 on my A2 20"er. But sitting up at a bench or off hand or most other positions it was fine.
I also have a seemingly pretty good quality knock off Colt Scope. That has the opposite problem. You need to get pretty close to it in order to have a really good sight picture. Or one that doesn't have shadowing on the outsides. And sometimes I have to crane my neck a bit.
Yes, mounting a scope on top of the carry handle is not as good as mounting it to a flat top. But it can work. Did work, and can yield good accuracy. Despite how lots of people act like you'll get SARS if you do it.