Forgive me for not answering your question precisely enough, but i know several expats in Jakarta flying twin otters, cessna caravans and similar aircraft with no previous experience on type. They got job after implementation or practice of 250hrs rule.
I also know for sure, my own experience, they requested pruve of 250hrs on type prior my employment here (bigger aircraft).
You probably saw in other post here on pprune that someone was calming that it is only DGCAAs recommendation but anyone seams to go along with it.
And i am sorry but i do not have anything "black on white" but looking forward to see it anyway.