BH, we are on different pages it seems. Maybe my poor effort in describing my idea. I am only talking about the contentious issue of the YC for a deliberate knock on. I don't wish to change any other set of circumstances.
The debate has been about whether or not a deliberate Knock on is deserving of a YC, as in the F'Sautia incident last weekend. My suggestion is simply that if in the circumstances the referee is of the opinion the knock on would have stopped a certain (in his opinion - no different test to the existing for penalty tries) try from being scored, then award a penalty try (as at present) and YC the offender. If, however, he does not form the opinion a try would have been scored, then just a penalty. I am expressing a simple thought that a deliberate knock on should not result in a YC unless, and only if, in the opinion of the referee it stopped a try from being scored.
I do not reference any other situation in my suggestion. Hooper's YC and the types of situations you otherwise mention just have no bearing at all on what I was proposing.