Uff alright, I wouldn't say that's a typical use case. :)

Anyway, any chance you look into it? Try booting with "debug break=FOO" (where 
FOO is something of top, modules, premount, mount, mountroot, bottom, init - 
see man initramfs-tools) and in case of question with the initramfs scripts 
running under "set -x".

thx && regards,
-mika-