Good question, I need to know too as I'm doing that Martha Stewart cake cake that is covered with meringue flowers next year so I'll bump you to see if anyone with experience with this can answer.
I would think that it would work...the meringue petals are light as air, were you going to bake them first and then pipe the centers and attach the baked/dried petals to the raw center and bake again? That's how I would do it. If that doesn't work you could try baking the center and petals separately then pasting em together with a little more meringue and baking again for a short time to set/dry.
Please post how it worked when you're done!
Laurie
Ha, I too, am making a Martha Stewart cake. It's the 7 tier, all white with the meringue daisies. I was just going to put them together with royal, somehow I thought it would be easier. I just wasn't sure if the royal would cause the meringue to break down. Fingers crossed 
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