I think for myself, if I were fortunate enough to have facehugger parasites to use as a bioassay in our lab, I'd be more interested in the xenomorph's chemical ecology as opposed to attempting to remove its ability to deliver the pathogen /embryo. Both Xenomorph XX21 and the pathogen are drawn to non-botanical life, yet they are not drawn to their own. Why? It has been theorised that an ovomorph opens upon detecting movement within close proximity, but again, it doesn't open when a Xenomorph is close, or whilst being moved close to a host by one of its own. It'd be interesting to investigate a potential complex bouquet of pheromones that signals 'xeno'. Consider, XX21 will attack all known biological life, yet they do not attack synthetics (which in many ways mimics a biological creature - when you account for all the possible types of life this parasite may encounter in the universe and the potential diversity, it doesn't see synthetics as having potential) this suggests there's something biological life projects that signals 'prey'.
Imagine if you will, if you could indentify these chemical cues, for example using electrophysiology techniques, to investigate chemoreception in the xeno... You could potentially create a 'chemical mask' to make yourself 'appear xeno' and thus, like a synthetic, would no longer be considered prey 😊
[Side note: this is the kind of work I do on invasive marine species in order to develop integrated pest management techniques, and it works in most organisms - it's always just a case of the laborious task to establish what chemical cues the creature keys in on]
