I don't think that is what he is saying. It is your claim that negotiations should be behind closed doors and the intention to strike not be announced that is illegal.
But regardless, your proposal to set such a deadline has no benefits, which is why so many people are against it. The only reason I can see why you want it is out of spite because your alternative arrangements this time has apparently been a waste due to the cancellation.
I can understand your annoyance about the whole episode because it cost you a lot of money, but your proposal helps no one - no one at all.
No I was. Or suggesting that at all. So the idea whether liked or not is not illegal? I was failing to see what was illegal about it but was willing to be corrected.
These "last minute" concessions are not new ideas thought of at the last minute, they are brought out on the table at the last minute to avoid the strike.
So,why is it so hard to get the concept that if you move the deadline then the situation is exactly the same. As long as the new system was stuck to then the company would realise that this is time to to play the last minute card. In effect the strike starts (albeit in a virtual fashion until the seven days are over) at the deadline as it would presently.
Whether you agree about the inconvenience or not the system would work. It would only take the first time when the company offers a concession during the seven day period to be rebuffed for them to learn the lesson that the time for the last ditch offer has really moved.