Osaka to Tokyo with JR East Pass Special?

Hi there!

Here are some answers:

1) Where can we purchase the Suica + one way N'EX since we will not be arriving at Narita?

I think the Suica + One Way NEX is only valid for purchase at Narita. But you could try purchaseing it at the ticket office at Tokyo station on arrival

2) Can we use the 3day JR East Pass Special (10,000yen) from Osaka to Tokyo Shinkansen?

I'm afraid not. The JR East Pass special is only valid for trains in the JR-East/Tohoku area. As the Tokyo - Osaka bullet train passes through the JR-East, JR-Central and JR-West zones, I'm afraid the East Pass Special will not be valid.

Hope this helps!