Android SMS/MMS Conversation Migration (Reverse Ownership and Restore to Other Participant's Phone)

I have a complete SMS Backup & Restore XML archive containing approximately 20,000 messages spanning about 10 years between two Android users. This includes SMS, MMS, and RCS messages. Goal: Restore this... (Budget: $250 - $750 USD, Jobs: Android, Android App Development, Data Processing, Database Management, Java, Mobile App Development, Mobile Development, XML)