valve stem replacement without removing tyre

[Houtman_imp]

I can imagine there may be emergency instances where a valve stem is damaged, like a lock/chain left in place, or sabotage, and this would be a good emergency fix, But I personally would not trust it as it relies on compressing the rubber in a way that might cause a split or crack.

I feel the same as you , alright on heavy duty equipment going at a lower speed, different on a bike going 70-80 mph.