Move encrypted home folder to new PC

[Colin Law]

I am moving to a new PC after the lightning induced demise of my old
one.  I have installed Ubuntu 14.10 and restored /home from the old
PC, and all is well, except that one of the users has an encrypted
home folder.  /home/user and home/.ecryptfs/user have been restored ok
but now I somehow need to setup a new user to access the encrypted
data.  I have the mount password.  Is there any way of doing this
other than manually recovering the data and copying to a new user?

Colin