I will soon be playing a wizard who I intend to become a transmutation wizard. However, I find the transmutation wizard sorely lacking in power. To remedy this, I have begun creating a revision. The first step in this revision is to replace the features granted at level 2 with the following:
Transmutation Savant, which still works as normal.
Starting at 2nd level when you select this school, you can temporarily alter the physical properties of one nonmagical object or part of it, changing it from one substance into another. You may use your action to perform a special alchemical procedure on one medium or smaller object (you may also use this on a single medium or smaller portion of an object) you can see within 30 feet composed entirely of wood, stone (but not a gemstone), iron, copper, or silver, transforming it into a different one of those materials. If the object is being worn or carried, the creature wearing or carrying the object must be willing. This transformation lasts for one hour unless you use your action to end it. You can use this ability a number of times equal to your Intelligence bonus (minimum 1), and you regain your expended uses when you complete a long rest.
Additionally, you gain proficiency with alchemist’s supplies. If you already have this proficiency, you gain proficiency with one other type of artisan’s tools of your choice.
Additionally, the Purify Food and Drink spell is a wizard spell for you, though you cannot use it as a ritual nor store it in your spellbook. Instead, you always have it prepared, and it does not take up a known spell.
As an action, you may touch a creature or object to restore 1d6 hit points to it per level of the highest level spell slot you have. Once you use this feature, you may not do so again until you complete a long rest.
Much of the minor alchemy feature is copied from here. I found conflicting answers over whether that was balanced, but sided with those saying no. It seems to me that the main potential issues are underpoweredness, overpoweredness from the range of Minor Alchemy's main feature, and overpoweredness/stepping on toes from Purify Food and Drink. Is this alternate feature balanced?