The common problem with your suggestion is that the economy is player-driven.
1. Increasing the supply of an item (it has been done before with reskills/restats with the red envelopes) hasn’t changed much as after the event passed reskills went up in price by roughly 1.5b within a few months, sitting at 3-3.5b.
2. Is a decent suggestion, however I would suggest making the scrolls Account Bound. An alternative to this could be something like a questing system that provides gold incentives, and perhaps some custom quest reward.
3. Making gold easier to access will simply make prices go even higher, as has been seen with the implementation of maps like Sahel and Oasis. Players have consistently increased prices to fit with the drop rates. So once again, the economy is player driven and is being driven higher.
4. A good alternative to this would be to make gold purchasable outside of the minimum, or at a lesser minimum than the original. But I can’t speak on this.