I don’t know if you will get to install ERPNext with wizard complete.
Another workaround I can think of,
- keep the current frappe server as your Authorization server.
- install another ERPNext server and add your frappe server as social login key. OAuth 2 provider for Frappe Apps - #12 by revant_one
With this your previous server continues to be live.
ERPNext server will login using the accounts from frappe server.