Anyone aware of a vocal FX loop that could be engaged for multiple mics, each controlled separately?

[Benn Roe]

I'm envisioning a box that houses three to four separate XLR signal paths, each with its own input, output, and footswitch, but with each signal isolated from the others. The whole box would then also have a single typical send-and-return FX loop that could be engaged separately for each signal path, using the appropriate footswitch. Does anybody know of anything like this? It's sort of a niche use-case, I guess, but it seems like a relatively simple concept, and could be a powerful tool.