If you are looking for a [brand] new bike, your smallest capacity option would appear to be a Moto Guzzi V7...
There are various [Vespa style] scooters out there which continue to utilise a gear-driven swing-arm engine/transmission combo, but everything* else under 1000cc these days is either belt or chain driven.
I know you didn't want to discuss the merits of chain vs shaft drive, but pretty much everyone travels 'around the world' on a chain-driven bike these days, and that is very rarely a disaster...
Jx
*edit. There is also Ural of course, but I suspect a sidecar outfit is not what you're really looking for?
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