The fact that a part may take weeks, months, or near forever does not make it a bad car, does not make it a bad dealer, and does not make it bad car maker.
At times certain parts run in short supply and may wind up backordered. The dealer has no control over this and if someone wants to bash Ford over this then you better start bashing every other car maker for the same thing. It happens with all of them.
And what is this bashing the LS as being a gas guzzler? They’ll get in the upper teens at least in city driving and 27-28 on the open road at highway speeds with the A/C on.
My son and daughter in law had an '01 LS and even with their lead feet that car would always get that kind of fuel mileage. I think it’s pretty respectable MPG for a fairly heavy 4 door luxury sedan.
As to any recourse (moot point now) you have none. There is no way on Earth that anyone is going to make the payment on any car for a reason like this.
Failure to make payments will simply mean you would discover the car missing from home, work, or from the mall after the repo guys have snagged it.