Honestly, before I would skip meals and wait, I WOULD try frozen / thawed.

IF it is available

I have converted all my snakes without a hitch. Granted, they were all hatchlings when I got them, but still.

Back when I took in and treated some "rescues" I even converted some imports, some of which had to be treated medically first. I always gave them live if that is what it took, would never starve one out of principle. But I didn't give up and even the stubborn ones converted.

I'm not saying F/T is the way to go. Absolutely not. Different things work for different people.

But like I said, if it was between trying FT and skipping meals, I'd try FT