Charlie,
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I'm not sure that you can go MLO if the panel qualifies as a lighting and appliance BC panel board.
If you are working on one of those somewhat rare cases where the transformer primay OCPD is permitted to protect the secondary conductors, then you would have overcurren protection on the line side of the lighting and appliance branch cicuit panel board as required by 408.36(A).
Don

Don(resqcapt19)