>>713572164
I don't see how that would work.
You can't knock a Necomorph out so a facehugger wouldn't be able to knock a Necromorph out and impregnate it.
And even if it somehow did the Necomorph DNA would corrupt what ever embryo it placed in the Necomorph.
Plus don't Xenomorphs need living hosts to impregnate? Necromorphs aren't living.