How to use Person Number in Federation SSO without changing User Name nor User email

Summary:

We are on 24B and hoping there has been additional SSO configuration possibilities in Fusion to support successful SSO on Person ID leaving User Name and User email untouched.

We have Oracle Fusion Financials, SCM and OTM with SSO and there is strong business reason to attempt to use Person Number as the SSO security token.

We are aware of Doc ID 2739060.1 How to use Person Number in Federation SSO, however in the document it states we need to have User Name same as Person Number. Doing so would break all our BPM Approval Workflows, Approval Groups, BPM Logic in Fusion Financials and SCM. Also complicates troubleshooting since User Name appears everywhere (Last Modified, Submitted By, Approval Flow notifications etc... etc..).