This is one of the issues I am aware of. Another is EFF v1 vs v2. Do you know how Tutu and BGT update the weapon proficiencies? For FotD I have been thinking about a REGEXP that looks at all the old ones, notes the number of proficiencies and assigns the equivalent new ones, so 3 slots in Large Swords will become 3 slots in every weapon that Large Sword includes, plus any new ones.