Plumber, that boiler is designed with the coil so I'm sure you can get a blank plate over the tankless opening, and no burner, but don't expect much of a price reduction. It is like ordering a car with no stereo or no A/C. They are designed to be shipped as a package and it literally COSTS more to have those items deleted than if you order it as-is and remove it yourself. I sure understand your dilemma of not using it anyway, so why buy it, but I also understand the old Henry Ford comment: "Your new car can be any color you want.......as long as it is black!"
I know this won't enhance your holiday weekend, but call LL and hear it directly from the owners.