Some alternatives I've tried using same exact series name for omnibus and individual members in a series. Omnibus series index = choices below.
1.23
123
123.45
The advantage of large numbers is it puts the omni's after the individual series numbers. But all alternatives I tried were clunky. Another way is to give it whatever index is convenient, then append to title: (Omnibus 1,2,3,4)
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