I’m sure any exhaust shop could chop off from right behind the resonator and run a pipe to the back. Weld on some tips. Should be quite cheap compared to a full cat back. .
I too would take it to an exhaust shop for a removal and build. Take in your chosen tip if they do not have one to select. As far as I know, you won't find just the rear section without purchasing a full cat-back that is muffler free.