This is a follow up to Is this revision of the level 2 Transmutation Wizard feature balanced?
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 (especially because, to me, any level 2 wizard subclass feature has to feel like a viable alternative to Sculpt Spells.) 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 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. When you have an arcane focus or component pouch on hand, you may use your action to perform a special alchemical procedure on one object or part 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. The object or the targeted part of it must fit within a 2.5-foot cube, and, 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. The transformation also ends if the transformed material is scrubbed with soap or ash (this scrubbing can be done as an object interaction.) You can use this ability a number of times equal to your Intelligence modifier (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.
Much of the minor alchemy feature is copied from here.
To counteract the potential economic abuse pointed out by this answer, I added the ability for others to easily reverse the transformation, and my DM has approved of merchants using this to counter fraud. While transmuting wood to silver can add 10,000 pounds to a block of wood, I imagine setting this up for combat could pose a challenge. An easy way around either of these is my main concern for balance, but I know I could easily be missing something else. Is this alternate feature balanced?