As alluded to above, comparisons in this sense with Thailand and Sri Lanka are not helpful. Buddhism is a philosophy which took on forms of religions in each country it spread to. The way Buddhism functions in Japan is entirely different to how it functions in SE Asia, South Asia, and Tibet. As indeed does the way temples and monasteries are run and maintained. It is the equivalent of comparing the situation of a pre-reformation English monastic community, with members of a small town American church community who volunteer free time to help with events and times of importance.
As I mentioned, most people working in such places in Japan do so in their spare time alongside other jobs in society, with only a couple of people based there full time. Most of them have families and function more like a village vicar or town pastor does in the UK or USA. In the example I referred to, the killer only managed to avoid detection for one day before being recognized. Even then, he was there under the pretense of helping a monk with a legal case, not trying to blend in as a monk.
Not trying to discredit your opinions or evident hard work and care about this, but just want to clear this up as knowing how these places function in communities here, it just isn't a possibility.