Hope you are all well.
Afraid you won't be able to do that with the IN72, could you possibly put it in front of the couch on a table?
If the projector has to be in that corner, you could hang a pull down screen diagonally from the ceiling and put the couch at the same angle of the projection.
Even an LCD unit with lens shift normally can only shift 50 percent of the screen width, which places the projector either one side or the other of the screen. Your diagram has the projector farther than the edge of the screen off center. You would need to move an LCD unit right to the end of your couch to make the lens shift work for you.
If you really need this placement, I would sell that projector and get a unit that can do significant horizontal lens shift, like an Epson Home Cinema 400. Or better yet, if still within the window, exchange it for one.
Sorry about the bad news.