How well your semi-bluff bet works is totally game dependent. So this is not something you want to do in most limit games, whereas in NL, you can often chase a villain away if he missed the flop. But that becomes read dependent.
And then there is the positional dependency.
In almost all limit games AK will likely hang till he's dead. In low buy in NL games, the AK is still likely to hang till he's dead. In higher buy-in games you are more likely to find folks who at least see the potential death card, and may be able to muck TPTK, so you would want a rainbow board for a snuggier feeling. But even there many will hang till they're dead.
Try figuring in how many will even see the potential death card (9). I'll guestimate 30% will see that a 9 is deadly. Means I think 70% will not even see that and are much more likely to stack with TPTK.