I would encourage you to do it but keep in mind that rhubarb is very bitter, and that taste will not go away. and will probably be accented with the hops. I also just made an excellent strawberry blond that has a slight bite to it. It taste like strawberries with no sugar in them. So you might want to add some lactose to it get that sweeter strawberry rhubarb flavor out of it.
Do let us know how it turns out though.
Melancholy Dog Brewery
Planed: more cider.
Secondary:Dry hopped amber ale, Does Equis clone.
Keged:Pumpkin spice, wizen.
Bottled: Hard cider, Oaked bourbon vanilla cider, Vanilla Porter.