How about forsaking the Erica mult for, say, a sub-mixer or two for the voices, and then a good performance mixer like the Roland 530 or 531? Some arrangement like that would fit in your case. Otherwise just get the wmd performance mixer. It is the best.

Small submixers: https://www.modulargrid.net/e/modules/browser?SearchName=&SearchVendor=&SearchFunction=6&SearchSecondaryfunction=&SearchHeight=&SearchTe=8&SearchTemethod=max&SearchBuildtype=&SearchLifecycle=&SearchSet=all&SearchMarketplace=&SearchIsmodeled=0&SearchShowothers=0&order=tag&direction=asc