you don't need briss to cut the borders. M92 got all non-destructive border cut functions you need. especially when you install booxtors
PDF-Patch2 you got additionally border cut function for odd/even page border cut's for special-case academic books.
after border cut in the
page settings, go to
reading-menu use enlarge to page-width, it will then adapt to the new margin border's you set before in the page-settings