Are you using the stock rings on the crankset? If you decide to go the derailerless route I'd make sure you were using singlespeed specific rings (which you should be able to get in both 32t and 42t) or old rings from the era before there were ramps and pins and "profiled" teeth. Having uniformly tall teeth and none of the little shift aids might just be enough to prevent the chain unshipping for your type of riding.
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