Thanks for that suggestion PRSXFENG, it worked great!
Don't know why I never thought of it before - I've got a bunch of those IR blasters controlling my A/C's over WiFi. I guess I just didn't think there'd be a suitable interface on that Smart Life App. In fact there were dozens, already pre-programmed. When I searched the list for Astro it was there, and when I tested it I was amazed to find it worked right away. So problem solved!
Thanks for the help!