You can even manually activate overcharmed status.
From there you can edit your data in two tabs: Inventory, where your health, soul, geo, and items are contained and Charms, where you can set whether you have charms, have them equipped, and their notch cost.
On the left of the main window there is the 4 currently loaded saves, each save has 3 buttons Manage and edit Hollow Knight saves for all current releases, Windows/Linux/Mac/Switch.