I love rhubarb - and I hope my large plants in my main garden have survived my tenants while they have rented my property! I'm looking forward to a huge harvest next spring, once I'm back there.
I freeze a lot for later use.
I make rhubarb/apple pies, rhubarb crumble & crisp. Cook rhubarb sauce to have over yogurt and granola, over Dutch Baby pancakes... I've made juice using a steamer, rhubarb chutney.
I think your pizza idea is fine - it's a great savory sauce. I've had it with meats before... would probably be a lovely counterpart to duck.
Looking forward to other posts to gather more ideas!