I think the rules just have to be simplified. There should be no prior op. If you are caught and don't dispose correctly. You are gone.
If there are hands in the back (fwd or backline) it's in the back. Umps should not be made to make split second judgements on force, prior, sufficient attempt etc. Call the rules black and white...no grey area.
The players will all adjust their game style accordingly to how the decisions are paid, if the umps pay them the same and effectively every game.
And while we are on rules, please Nick off the 666 and stand rule 🤦