Thanks for opening this discussion
I research in our knowledge DB and didn't find similar cases.
I noticed you opened also a case in support (#01359975) where we are putting this same answer:
We don't know of any utility for converting or migrating users from DB-to-LDAP.
Customers or Services usually develop their own process.
Some possiblilties:
1. Design the schema in LDAP - tables to represent the desired infrastructure
2. Export users from current MS SQL and convert to LDAP format (ldif format)
3. import ldif formated to new user store
Please, let me known if this respond your query.
Another possible course of action would be to export the SQL to a csv file. Then make an ldt template (CA Directory doc) and convert to ldif using csv2ldif tool (CA Directory). Then import the ldif.
Of course, this assumes you have the new IM Use Store schema and DSA db ready for use.
You may also open one idea in our community suggesting have a tool