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Couldn’t you simply send everything to a particular subgroup and use that to feed the mono center fill, while using the LRSub config? Just be sure not to assign that group to your mains and remove the aux sends from it (unless you want them).

Isn’t it possible that you can assign subgroups to other subgroups?
Ex. Assigning Subgp 1, 2, 3, 4 to subgp 8


Could another possibility be to assign you LR mains to a Mono Matrix output to run your center fill?