It is a simple screwdriver, if you just need a flathead, then you could use some glue to permanently keep the bit inside the head. I am pretty sure the bit will fit. (that rhymed) the flathead should be a pressure fit, and I am going to release a phillips-head bit for it too.

Scale the model down to 10% scale, I make these models very large in the model creator I use.

Scratch that, the other bit is published!