Our plan is to purchase the Exchange Order for 2 JR passes in Thailand on Nov 29th at the soonest. However we will not arrive in Tokyo until December 29th to receive our JR passes. We need to reserve 2 seats on the Sunrise Seto overnight train from Tokyo to Takamatsu the night of December 29th. Since reservations open 1 month in advance for this train, how might we procure a reservation holding only the Exchange Order for the JR pass?
If this is absolutely impossible, is there another similar option for getting from Tokyo to Takamatsu besides by plane that would allow passengers to sleep through the night?
Any insight, suggestions or answers are greatly appreciated!!