No, they can't. The lower tier chips exist pretty much entirely because they can be easily converted from the higher tier chips that are defective. Purpose-building a lower tier chip would be a ludicrously expensive thing to do, or else they'd already be doing that.

A fun example of this is Apple, who used to build three dies for each M-series generation (base, Pro, Max) but now build just two (base, Pro/Max). You'd think one of the most bespoke companies on the planet would not be moving to fewer dies unless there were very compelling reasons to do so.