Hiroshima to Tokyo feasibility

Hi,
Im am planning a Japan trip and want your feedback please.
Landing at Kansai airport then train to Hiroshima for 2 nights. After Hiroshima and Miyajima island train to Kyoto for 4 nights. From kyoto side trip to Nara, Osaka and Himeji castle. After sight seeing within Kyoto, train to Tokyo for 5 nights. From Tokyo side trip to Hakone, Enoshima island, Kamakura and Yokohama. Few days roaming in Tokyo streets including Odaiba. Leave Tokyo from Hanrda airport.
Will use '7-day JR pass' for the first 7 days and after that while in Tokyo will use IC cards etc. (may suggest here the best pass to commute).
I have not come across any itinerary in this direction/path; so please comment on its viability including immigration clearance at Kansai/ conversion to JR pass and seat reservation for Bullet train to Hiroshima and any other point.
Thank you.

What is it exactly that you are unsure of? You can see on the JR Pass website that it is possible to exchange it at Kansai airport, and you can look up connections from Kansai airport to Hiroshima on Hyperdia.

What you need to note is that the pass is only changeable at the JR office at Kansai Airport station. This office opens after the first train arrives and before the last train leaves. This means if your flight is at some ungodly hour than you cannot use the pass on the first day. Or you got to sleep in the airport and wait till the office opens.

With regards to time and places, I see no faults. A day in Hiroshima and a day in Miyajima.
Then four days in Kyoto sounds valid. I would always opt for more time in Kyoto. I can skip Osaka altogether if I am spending too little time in Kyoto.