100% this.
One of my absolute favorite keyboard designs: G915 TKL Lightspeed got relegated to the donation pile because the symbols were NOT backlit. Such a dumb design choice to save a few cents IMHO.
The only issue is that the keycap itself needs to be partially translucent and partially opaque, so rather than laser-etching or printing a legend they need to be "double-shot"[0], which means a two-phase injection molding process. This makes altering of the keycaps quite expensive as you need a new set of molds - which is especially bad if you were using one mold to produce an entire set of keycaps at once.
It's definitely doable to ship it with two different number rows, but it's the kind of thing you really want to know at the very start.