Best Way to Combine 9 sided NGon in Scooter Model

I got a very specific question here, and don’t know if its the right spot so feel free to delete this (mods) if you like.

Pretty much I need to fix the topology on the seat piece of the scooter here so that there isn’t any pinching, but still maintains a somewhat square shape. How would you go about fixing the massive 10 sided (I think) NGon in the screenshot?
Posting the blend file here (I’m not sure on the protocol here, so again forgive me for my noobishness!)

http://pasteall.org/blend/index.php?id=50687

Thanks again !

enter image description here

-DC

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