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I would start with asking on the Royal Caribbean board, here:
https://boards.cruisecritic.com/forum/51-royal-caribbean-international/
It is a somewhat usual request, so not sure if anyone would know the answer. There is, is you look deep enough on the Royal Caribbean website, a list of forbidden things. Not sure where this would fit, or not, on that list. Lastly, you might just have to call RCI.