Firstly, I am sorry to hear of your diagnosis - not an easy thing to have to live with, I'm sure.
Assuming that you already hold a Class 1 medical, the first thing I would be inclined to do is to ensure that you can get your Class 1 medical renewed before your transplant.
Secondly, the people to ask would undoubtedly be the AMS of the JAA state that issued you the medical.
It may be that there is a blanket denial of Class 1 medicals to transplant recipients; on the other hand it may be done on a case by case basis and that may itself be based on medical tests run at the time.
HTH
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