The Omnium crew did this a couple of years back with an orange 1st or 2nd gen Cargo, they had quite narrow clearance though so it still meant they were only running 650x42s I believe.
I has definitely been done though which is probably why they brought out the WiFi
Has anyone DIY dimpled the OG omniums chainstays?
I need a new rear wheel and just stuck a 650x47 to test - the clearance is close enough that a minor buckle is not going to be too much fun.