I can remember having that problem about 40 years ago on a tandem using Stronglight 99 tandem cranks and a Suntour triple FD, though there the inside of the stokers crank was actually brushing the derailleur cage in top gear. After thinking about it for a while, I figured that my 52kg wife and stoker wouldn't be unduly stressing her cranks, and I took a half round file and removed about a 1mm deep curved section from the inside of the crankarm so that it cleared the derailleur. The crank was still holding up fine when we sold the bike about a dozen years later, and was still holding up fine several years after that when the tandem was stolen from the cyclist who'd bought it from us.
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