Few years ago I was testing one Linux OS with Wubi on Windows so I am familiar with it and it is was a very bad experience.
is it possible to do a forensic recovery and keep all of the recovered file names intact or in other words, original? that way it would be a lot easier to just search for stuff like wallet.dat
I don't think that any forensic recovery tool fill find what you are looking for, but if you have some backup (root.disk) maybe you can try temporary restoring that Ubuntu OS with Wubi and copy-pasting all files you need.