Check the recumbent specialty internet retailers. They sell chain by the foot so you can get however much you like.
FWIW, I'm not a fan of running a too short chain even if you avoid the big/big combination. The day will come when everything is going great so you start up a hill in the big chain ring - you know what comes next.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.