I think there should be a sticky post on this topic, it's comes up from time to time. Alas, I can't find my old thread where I asked the same question. I'll keep looking...
I considered doing this, but gave it up because it doesn't work well for some certain arts. If you're looking for a low powered saga, it works well for the elemental arts but it makes most Mentem and a few other notable effects out of reach.
Edit: Found it [url]https://forum.atlas-games.com/t/hermetic-arts-as-difficult-arts/5104/1]