I do this with my 8x10 and 14x17 holders, but I must say that that is over kill. I only use a very small piece in the centre. I found that any more makes it very difficult to remove the film.
@grahamp you're right. I didn't realize it was public here... sent it in a PM! I removed the guides for the holders so the film just pushes in... I have some 8x10 holders like that