Hi,
Yes, it could be reversble. Based on my personal experience. I was having severe heart palptations and chest pain and squeezing feeling deep in the heart. My SF was 10,000 and i did a T2* and there was huge iorn overload and i scored 14 which is too low. Docotors adviced me of intensive chleation of desferal and L1 and this is the best combination as the L1 is a heart protective.
Currently i get those palpitations and pain evry now and then and not so frequent and not like before. Also, SF is now 5000. and My last T2* score was 18. This proves that it is reversable and can be better if you get rid of the iron.
I'm still have alot of effort to do and a path to continue, however i had some obsticals but i'm fighting harding to get rid of that iron and be above 20 in my T2*.
Be brave, optimistic, and always think postive as this will always help you even it is tough and difficult and needs some time.