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Cost-Benefit analysis, if you wanna tinker about, Tektro sells refresher kits for their levers blade and pivot which cost just as much as a full lever, I concur it looks close enough to work but you'll never know until you try.
Give ISON a call and ask if you are really into fixing it.
Again, Cost-Benefit Analysis, by the time you've spent researching and cost for the spares, it'll be more than a MT200 on trade.
I'm all for fixing stuff but not when it takes too much time.
tallsam
Get Shimano, cheap as chips, reliable and not much fuss.