I guess it would depend on whether Kainan figured the Moorwen would be a threat or not. I don't see him seeing the military's experiments much beyond the scope of what his own people were doing.
I like the other option... a sequel of sorts. I think it presents a lot more opportunities for thoughtful development of the first film's ideas. Basically modern scientists/military find remains of the Moorwen and Kainan's ship at the bottom of the lake. They clone the monster and also somehow trigger the distress beacon summoning the aliens/advanced humans.