I think if you got a palisade or seltos key and programmed it to your car it would work.
The telluride is identical to the palisade, so I assume the modules are the same.
The seltos has the same key as the telluride with the button on the back.
That is the first route I would try if I finally bought the telluride vs going aftermarket.
If you try it and it works please PM me so I know it is correct.
The dealer would likely tell you it doesn't work, but wouldn't know unless they tried it so I would err on them not knowing the truth.
NEVER good to assume