Gaimen Kirikae/ Converting Drivers License – how to get an appointment??

I am looking to convert my UK driver's license to a Japanese license, but I cannot seem to get an appointment as all slots are booked up 3 months in advance.

Is there some secret something I am missing? Has anyone just shown up at the test center and got a spot? I only need an appointment for a written test.

Any advice is appreciated – thanks!

by Visible-Paramedic-80