I got a male of almost exactly the same size in a similar situation; he ate two times, making it seem like everything was alright, then just stopped eating for two months, no matter what I did. Though in my case the cause was most likely winter/breeding season, it was the same problem. One day I tried feeding him a live (adult) mouse, and he struck within 5 seconds of getting it near him, based on smell, since he hadn't even seen it yet. So yeah, I'd recommend a living mouse. I don't think it would be too big for your snake, as it was fine for mine as well, and he also weighed slightly above the 200 grams. He's been eating just fine (f/t again) ever since. Mice aren't nearly as dangerous as rats, but just make sure to watch over the snake and the mouse while they're together. If you're very concerned about feeding live, maybe you could try pre-killed.
