Ubiquit,
I recall the Avnei Nezer does not allow it (at least leKatchila) he does say something to the effect that the Admor the Chozah of Lublin did use a Murkav (esrog of Kurfo), due to him being a decendent of the BaCH who allowed murkav. For the very same same reason he allowed Chadash, being that the BaCH allowed it.The Avnei Nezer is located at the end of the Chosen Mishpat vol.
Also, many Polish gedolim came out with a proclamation against אתרוגים קורפו. Including, the Gaon of Kutna, Nefesh Chai, Kli Chemda etc.
However, there is a responsum by the great Sefardi Gadol the Sba Kadusha Rav Alfandri ztl claiming that grafting lemon is not Murkav.
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