Rehydrating the mushrooms and then using the water in the recipe sounds like an excellent idea, just a little more mushroominess. My wife detests mushrooms, she is the only person I have seen pick the mushrooms out of cream of mushroom soup! It is a textural thing not flavor, so to get around that anytime I cook using mushrooms which I leave big enough for her to remove and give to me I will grind up to powder some dry mushrooms and add to whatever I am cooking, even more mushroominess!
bob