I had same issue - somewhat. I refuse to pay $65 for a tiny remote that functions only my shades so I wondered what I could do. Ran across your question. Did a search and found a website with hexcodes for Hunter Douglas! Maybe it will help. As for me, I broke open my remote, and with some tape and foil..it works! Ugly but free!
I cannot post a URL here since I am new but do a google search for hunter douglas power rise hex codes. Good luck!