Zelle is also built around the idea that each identity will be connected to exactly one bank account, which is very irritating.
I believe a single Zelle identity can only be linked to a single bank account, and a Zelle identity consists of an email address, phone number or both. Typically it's the "both" option, but I think that in theory you could create multiple identities with multiple email addresses, and link each to a separate bank account
I don't know the answer, but seeing as Zelle was developed by a consortium of big banks, it's at least possible they simply don't want to support this use case, because making it harder to have multiple accounts benefits incumbents.