Osaka-Kyoto-Tokyo

Hi...
I will arrived at KIX and plan to use the Haruka to Shin Osaka. If I buy the Haruka&Icoca Card at KIX will I be able to use the card that I get for my journey in Osaka (2days) & Kyoto (2 days)? The validity of OneWay for this card means only for the usage of the Harika Train rite?
Since the balance wil not be enough for my 4 days journey in Osaka&Kyoto, where do I can recharge the icoca? Can I do it at Shin Osaka station?

I plan to use the Tokaido Shinkansen from Shin Osaka to Tokyo. Should I refund the Icoca at Shin Osaka or I can refund it later at Tokyo Station before I leave Tokyo to Haneda?

Thankyou