What's an easy way to view a copy of a text buffer as a hexl buffer

I sometimes want to look at the hexl-mode view of a text file buffer in one window and in another window I want to keep the original text view.

What's an easy procedure to do so? -- Due to the fact that I cannot easily clone a file buffer, it means I have to create a new buffer, copy the content and then hexl-mode this new buffer. Is there a simpler way?