I am a yoga teacher and long-time practioner too. I love live music with class and think it will work really nicely with a restorative class. My one suggestion would be to perhaps play at someone else’s class the first time so that you are not juggling going around and giving assists, being a wordsmith as you lead the relaxation, etc. It might just help to feel the harp experience first yourself before trying to manage it all. Wish I could be there!