Since the titleblock tags do not reflect on the drawing itself, utilizing the PLM_Properties seems like a better solution except that they don't update as the Items are released, meaning any properties that change on release (like Major and Minor Rev) won't reflect on the released drawing.
The idea here is to either have the Update primitive either automatically or have an option to update the drawing with the latest properties after the release happens. Even if there were a primitive that did just this and it could be put after the Update primitive, that would work as well.