1: No rolling.
2: Remove Artifact ratings entirely.
3: Set prerequisites for each Artifact on a case by case basis. Like, a sword may require only Craft 3 while a clockwork soldier is going to require Craft 5, Lore 4, Occult 3, War 3.
4: Set a timeframe for each construction and required resources. If the player invest that time and has those resources? Success! Otherwise, failure.
5: If you have higher than the minimums, certain Charms or extra resources you can do it faster.
6: During chargen you can begin play with an artifact by spending BP equal to the sum of the prerequisites.