I hate to throw the FIFA career mode line at you guys but, yeah, this isn't career mode. The areas that are essential for me are CAM, CM, RB, LB cover, GK cover, that in itself is a lot of work, never mind finding a striker which is tough in the best of times, and finding a second quality CM. Aside from the logistics, you'd be creating a lot of instability going into next season.
A second CM/Xhaka replacement is just creating more work than necessary, You lot need to get over your Xhaka trauma for another year. Auba and Martinelli should be fine to hold the line next year.