“Blue Shirt”, the second issur you are referring to is “Hefsed/ruining”, and not “shinuy tzura”. One actually may change the form of Shmitta fruit such as to make jam, juice or wine, provided it is considered the “normal” usage of that fruit. Whether or not this applies to an esrog is a machlokes HaPoskim. In any event. sticking cloves in an esrog makes it shrivel much faster and would be considered “hefsed” and is not allowed.
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