Just not feasible though. Smart TVs have everything in an integrated line, from the screen controller, down to the external ports. It's like saying "Hey, I just want to take the North Bridge out of my motherboard because I don't use the features". Not gonna happen.

Now, in an alternate universe, if somebody went down this route and made replacement parts to remove all the cruft, you'd essentially be buying an entire new TV. There is no cost savings there. Buy a monitor, and hook up whatever smart shit you want at that point.