So for some reason, the institution wants the final author in all cases to be first initial then surname, but all the rest are surname first initial?
In my humble opinion, whomever has written these instructions is just trying to mess with any kind of automation. If it is a publishing house, ask them if they have a solution. If it is your institution, ask others how they met with this requirement?
Not to mention, the use of U. in the context of two authors, looks like a long string of initials!