Upvote:-1
Was Chanakya alive and so active during Ashoka's childhood, that he was able to play a second king-making game?
Yes, Chanakya lived till 87 while Chandragupta lived till only 40.
Was Bindusar's mother (the Greek Helena) so cruel and hatched a plot to kill him?
Yes. This was a common practice among queens to get the kingdom in favour of their sons.
Did a Persian friend called Mir Khurasan really came to Bindusar all the way from Persia and decided to stay on in Magadha? (Was Persian language even invented at ~300BC?)
Yes, the Persians were earlier defeated by Alexander and wanted revenge at any cost, so they became friendly with Maurya dynasty through marriage alliance.
Did Mir Khorasan and Helena really hatch a plot to get hold of the Magadha empire? If so, how come they didn't succeed?
Such plots were common, they did not succeed as Chanakya prevented them from doing it.
Moreover Persians and Greeks never trusted each other and were often at war with each other.
Upvote:7
Since you like "rich media," you might wish to consult this recent (5 Feb 2015) discussion (audio here) on the BBC Radio 4 series "In Our Time." IIRC the guests (Naomi Appleton, Jessica Frazier, and Richard Gombrich) seem to have concurred that
Gombrich is particularly emphatic (starting ~9:30 in the audio) that "the only evidence we really have for Ashoka are his inscriptions, and all the stuff about his having been a violent young man and all this comes from many hundred years later. It's of course very typical of hagiography[...]" When the interviewer (Melvyn Bragg) asks, "So you're casting [doubt] on everything that's been said so far?" Gombrich replies, "absolutely."
However Appleton is somewhat more equanimous in her blog: "Perhaps there has been too much of a tendency in intervening years to read the edicts in the light of the texts, rather than as an independent source. Yet I would hate to see the texts dismissed as irrelevant to the story of Ashoka."