I’d say this is likely more suited for the lore discussion subforum, but there’s a lot of interesting material already teased/provided concerning some of your questions & ideas~
The Triglavians as a race actually comprise three kinds of life, some slightly less traditionally human than others - the “Narodnya” are more or less traditional humans so far as we can tell, with the inclusion of bioadaption tech (mutaplasmids, etc) among other things. “Navka” seem to be some sort of “spirits of the dead”, so to speak, likely some kind of infomorph (consciousness/memories in data form) preserved as a new entity after the death of the original; and we don’t know much about “Koschoi”, the third one, but they seem to be something a bit more impressive than either of those (and act with high regard by the rest of the trigs).
All of these come together in single entities known as “Troika”, like Zorya Triglav - that is, one of each, all residing in one Narodnya body - which act as the crew for pretty much all their ships & other things we as players encounter.
Trigs in general seem to not really need the sort of machinery we as capsuleers require in order to be immortal as we are - they likely have a bit more access to special tech that would make it far easier to clone or be reborn in a different form of life in the collective, without the need for a big, stable capsule containing all the necessary parts in a sealed environment. The trigs very likely branch off from an older group of the Jove, who themselves already would have at that point had much more effective & simple ways to clone/be immortal etc than we have now - I don’t think they have much to learn from what we as capsuleers use.