Just curious if that's a thing, and what it would sound like. Preferably not juxtaposed, kinda cheap IMO, something more along the lines of two different sounds layered.
Maybe Confessor, although they're tech-thrashened trad doom. Most bands that fuse the two are more in the juxtaposing category, e.g. Dream Death, Seventh Angel, thrash songs with doom passages or doom songs with the occasional thrash riff.