Would this wall control work with my Hunter fan that came only with a remote? Would I have to replace receiver in fan? If so, do they sell receivers?

If you want to use a remote, check out Lowes Item#0745359. It's a great all-around remote. This remote comes with a receiver. Regardless of the universal remote you choose, you will have to replace the receiver. If you need more specific help, don't hesitate to call customer service (800) 643-0067.