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@kerley
Chain-line will not be messed up by using a 3/32 chain, you could even use a 1/8 with no ill effect on chain line (although not suggesting it!)
And yes it is easy to get cogs from 15 up to 22 teeth and I would recommend cogs with a nice wide base (i.e. Gusset double 6 who make a 19t) so they don't cut into the cassette body.