I think both could work with some tweaking. Have the born queens\royal facehugger as the primary method of reproduction and in case of a missing or destroyed queen and no royal eggs to replace it, have a warrior make one via eggmorphing or morph into some kind of temporary pseudo-queen to keep the hive from dying until a new queen is established.
To keep room for the born queen, it would stay an emergency measure resulting in the warriors death from overstraining and increasing imperfections in the offspring with every generation not made by a born queen.
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That could definitely be cool-I have been considering adding eggmorphing or some form asexual reproduction to the Aliens lifecycle, as the King is more of a title than an actual gender or sex. It's more an idea for a solitary strain of Xenomorph-sort of an autonomous self reproducing drone or something, maybe with 'face hugger' traits seen in its adult form (a long prehensile tail, spidery dorsal tubes, an ovipositor of some sort). Maybe such a creature could occur in areas with the lack of a Queen, or be an alternative strain or evolution for a solitary variation or something of Xenomorph (ie like The Deacon, Neomorph, Protomorph, etc). I'm well aware that an impregnating adult isn't immensely popular *cough cough* Predalien *cough cough*, but I think there is some sort of good Gigeresque horror that could abound from something being able to directly infect you with its brood, stringing you up in its nest and either turning you into an egg or a cocoon for its brood to properly gestate, or perhaps it grows curious what you and does to you what happened to poor Lambert.