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I always refit rivets after adjusting a chain length, no failures so far. Use a proper tool and a dash of ability and hey presto. Never ever skimp on the backing off the tension step or you will get stiff links and a world of trouble.
I don’t think we had quick links when I were a lad. I do remember the old boy at our LBS used to give us maintenance lessons whenever we took a bike in to be fixed. Sort of learn to fix it yourself and there’s no charge. This is back in the days when there were less than 6 sprockets on a cassette so maybe the world has moved on a bit since then. But I fuckin ain’t.
I Don't want to piss on your cereal... but!
You shouldn't be re-fitting rivets in the chain - it'll fail pretty quickly. Use the correct jointing pin (if it's a Shimano chain), or the correct quick link for basically any chain. Also, always use a new quick link - it's cheap insurance against a chain failure.
For cutting cable outers (and inners) use a half-decent set of cable cutters. They'll leave a clean & square cut. Using side cutters or pliers etc. can work if you judiciously file the end of the cut outer, but proper cable cutters are quick and easy.