Unfortunately there is no real solution to this, that would work in general case. With renegotiation, the power gets cut off, but most likely every device will

Unfortunately there is no real solution to this, that would work in general case. With renegotiation, the power gets cut off, but most likely every device will get the allowance and all of them will still charge. With no renegotiation, a newly plugged in device might not charge at all. Not sure what's worse.