I don't think the way to go about addressing the 'flop' is to call a tech foul.
Firstly, the referees need to get the charge/block call correct. It is hard enough for a ref to establish this rule, without adding the consequence of a tech for a flop. It's another split second decision referees will be forced to make and another they will get wrong.
Secondly, the defensive player is at a disadvantage when he flops. If the referee lets the play go with a no call, as he should if the defender flops, the team's defense is at a 4 on 5 disadvantage. Surely the players are going to get it through their head that everytime they flop to the floor, defensively they are undermanned.
For example, in the Patty Mills footage above, Patty flops and falls to the ground as Wilson blows by him. Had the correct decision been made and the play allowed to continue, Patty looks like even more of an idiot and Cairns have a 5 on 4 for a few seconds. The referee has made 1 decision over 1 call.
Surely, if the referees can work on getting the charge call correct in the first place, players will quit making themselves look like idiots by consistently falling on the floor for no calls.