"twice lucky" is correct and usable in written English.
You would use it when referring to someone being lucky on two separate occasions. For example: "John won the lottery twice - he was twice lucky!".
Its success is critical to establishing their credibility as big-time restaurateurs, rather than twice-lucky publicans.
Obama is twice the luckiest President in living memory: He is not blamed for the current crisis and he has the luxury of watching the meltdown, and his lame-duck predecessor's rescue efforts, safely from the sidelines since November.
We actually get lucky twice.
(As it happens, I was lucky twice: after my swearing-in, Georgia added major depressive disorder to its list).
The nation has gotten lucky twice in recent months when attempts to bring down a plane over Detroit and to explode a bomb in Times Square failed.
Then UEFA struck lucky, twice: Mr Johansson in 1990 became its president, and in 1998 failed to do so at FIFA, the game's world body.
Kenny was lucky twice with shots that squirmed away from him but redeemed himself in the final action of the first half when he managed to turn Anthony Knockaert's free-kick over the bar.
In a random sample, after all, someone will be lucky twice just as someone — I name no names, think green and white and football — will be unlucky for forty years.
