As with any straight odds strategy, as they say, if it has odds no matter how big then the bet could win and you would lose.
You can do this with a single trigger:-
lay dealer round 2
If Met- Dealer points is in list 7,8,9 AND Any other selections cards contains values blackjack.
Using Time Machine for July 2016, didn't get far to find the answer.
See screen shot, Turbo BJ 06/07/16 3:50 the 9 in the dealers hand completes a 5 card charlie.
On a good day the strategy might make around 35-40 wins.
No not a winning strategy. Keep trying though.