I don't get it, shouldn't shady elements in Eorzea "retrieve" Gaius (may prove impossible due to the uncertainty of how much damage from Praetorium's explosion resisted by the said magitek armor) and Livia's body (hey she's laying there!) and scrap their magitek armor and send it to Cid to reverse engineer them?
As for live guide on how to activate or use or maintenance, Eorzea have necromancy and that "resurrection" method from the alchemist final lv 50 quest. Oh not to mention, we surely can ask Hydaelyn to "revive" em considering how many times we've fullfilled her requests

And lastly, i dun give a damn about ethics because we're in war with those scumbags!