I usually go to my local custom exhaust place - they've fitted many full systems for me with 200 cell 'sports' cats - I've never had an issue with the MIL light afterwards. I usually fit new lambda sensors while I'm at it - NTK ones as it happens, they've been fine despite some people saying that only Bosch ones will work.
NB I don't think that a repair using chemical metal (or similar) will work - the cat gets very very hot as part of the chemical process to scrub the exhaust gases, so its likely that either the repair will fail, or else there will be a chemical reaction with the repair material itself causing the cat internals to become contaminated, and most likely the downstream lambda sensor if you have one.
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