A chain is 2 minutes a day, a shaft is tens of minutes every few thousand miles and hours maybe three times in the bikes life.
Modern chains never snap they wear, some shaft designs are bullet proof others not.
You can buy industrial chain anywhere to get you going, splined shafts come from Germany, I don't think Moto Guzzi ever sold one, so goodness knows how long it'd take to find the right bit in their stores.
There is nothing in it. Pick your bike based on overall performance not some niggling technical detail. Some chains (eg BMW F650 single) were as underspecified as some shafts. Others go on for ever (MZ enclosed chain 100000 miles and it's industrial with a clip not rivetted O-ring).
Andy
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