I don't know of an alternate. But, since I would describe this as a vanilla citrus, perhaps use vanilla with a very small touch of lemon for the citrus when you put in the extracts.
Any chance you have a Hobby Lobby near you? We just got one & I was thrilled to see they carried it as Michaels & AC Moore do not.
I am a Princess emulsion user but I am not sure how to describe/suggest an alternative. I say this because the emulsion is stronger than an extract and does not bake off as much. If I remember correctly, I think there is a bit of citrus, almond, vanilla, and butter. I have used it for so long that I never really stopped to think about the different flavors in it 
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I do suggest that you pick up or order the Princess, Buttery Sweet Dough emulsions and of course Fiori Di Sicilia!! 
I hope some of our other CCers can help you more than I did!!
What is Fiori Di Sicilia and where do you buy it?
Never heard of it.
PS I really, really like Princess.
Fiori Di Sicilia is a citrus and vanilla blend, also used in pannetone. I get mine from king arthur flour . Com. I love it!!
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