It would really be "a small matter of programming" (as early IT staff used to call difficult but manageable tasks) to compute the best gliding route towards a suitable landing site and steer the pilot towards it.
That is what Xavion does.
It is not integrated but works apparently quite well indeed as AOPA and some others who tried it say. The guy who made it flies a Evolution so he is quite aware of the problem. (He is also the guy who made X-Plane).