I think you should look into cygwin or cygwinX which will give you a
bash unix shell or X-server from within windows. Not sure but I didn't
think you could use wubi like you are describing. Alternatively,
virtual box is also availabe for windows, though it does not, In my
experience, work as well as it does on Linux. The best comercial
route may be vmware. -just my 2 cents. Hopefully I understood what
you were talking about properly.