Unfortunately, I can't share any opinions because I didn't have to migrate from hive to UC on my project. I suggested UCX because colleage of mine had good experience with migration using that tool.
But, since existing pipelines that use the Hive metastore cannot be upgraded to use Unity Catalog and to migrate an existing pipeline that writes to Hive metastore, you must create a new pipeline and re-ingest data from the data source(s) I would follow best practices that one of creators of DLT framework - Michael Armbrust mentions in below video:
Delta Live Tables in Depth Best Practices for Intelligent Data Pipelines (youtube.com)