You should be able to use the bolt and washer setup you posted about to attach an ACOG to your carry handle. Depending on the ACOG you’re using the BDC might not work exactly right because some ACOGs were designed to be mounted that high and others were designed to mount on the receiver. BDCs are so variable dependent that they never work out exactly anyway. Just shoot the ranges and figure out what it does for you. Some ACOGs are more generous in their eye relief than others; you may find that it sits too far forward, in which case you can drill a new mounting hole further back in the handle.
The AR15A4 is prob my favorite. For a while mine had an ACOG on the rail but now it’s back to carry handle. While mounting anything above a carry handle is sub-optimal, there are plenty of dead bad guys resulting from optics that high, including ACOGs.
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