That's a tough one. I don't think Bakchourios would
work because there's also a T at the top (O, V, T, P). You are right that there's also a A below. I can't think of anything that would fit. We can be pretty sure that an office or dignity is on this
side, because the other
side has the personal name. Perhaps B-K stand for 'BA(S)ILIKOV' (imperial), and the rest of the letters could solve Chartoulariou.
Regards
Gert