Both Barclays and JPM used to do an equity option - standardized - cover write benchmark. I don't subscribe anymore, but it used to be done on the individual names in the S and P 100. Vastly different outcomes than when you benchmark to a cash-settled index. The devil is in the details. Make a friend there or hit one of their conferences. Bloom may carry it - I'd have to look.
Last time I saw it was about 2010. They did an entire series as "hedged equities as an asset class." My buddy was an MD of the group.