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If the string is too stretchy
I have a spool of Kevlar twine I bought off eBay years ago... Wasn't expensive and comes in handy now and then.
The original purpose was for a DIY electronic shifting setup I was working on, to wrap around servo-mounted spools and run through short lengths of housing to the derailers in place of normal cables.
That much of the idea seemed to be a goer, but the whole point of the project was to enable a half-step triple (38/52/53) - I'd established it could all fit on a double crank with the two big rings really close together and the small ring only slightly inboard of standard... It looked like a winner.
But of course it required a bespoke FD cage and double big ring (the proof of concept setup I did was too flexy and obviously lacked shift-assist cutouts and ramps). Would've been nice though; that chainring combo turns the upwardly-curving line of gear ratio vs gear number into a nearly straight line.
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Kimmo
This is a thinking man’s hack. If the string is too stretchy, I reckon a wire coat hanger might be long enough when unfolded 👍