The spice is the source of the prescience, I don't think you can draw a line between them (the Tleilaxu could, but even then I think they used what they called synthetic spice, I don't really recall that very well though).
Aside for that point, yep, I agree with pretty much everything you said!
I don't really agree that the spice wasn't put forward as a way to salvation. I think it clearly was key to finding the golden path.
The spice enabled the Bene Gesserit to see what was needed in their breeding program, and they were trying to breed Kwisatz Haderach who would lead humanity through a dangerous time, avoiding the destruction of the race. (Also the scene in the sietch that I won't go into detail about, becuase spoilers)
Leto II uses the spice to see the golden path and forge humanity into what it needs to be to survive. (Also the other thing which I haven't mentioned due to major spoilers of a cool moment).
The spice is pretty clearly necessary for the path taken to salvation.
While the spice may not have been necessary to avoid the destruction of the human race had another path been found, in the story as it was told it was absolutely central.
Richard Feynman had a really good bit about how bad human intuition is about quantum physics. About how we evolved to throw a rock at an animal out on a grass plane, and not to make good guesses about the nature of particles so small we can't even fathom them.
Storage of easily enriched material to prevent theft is a concern, especially given the number of incidents with jokers photographing themselves inside nuclear facilities and the results of FBI testing of nuclear site security protocols.
Additionally, given the ridiculously long half life of the products, you get into conversations about what happens on the thousands of years time scale in which it's not reasonable to think that any given state remains politically stable.
Pretty sure the ball bits are always screwed on (Archer: Phrasing!). If it's coming loose some locktite or nylon plumber's tape should hold it in place.
Edit: misunderstood what OP wanted to do, leaving this here in case it's interesting to anyone.
Sounds like what you are tyring to do is called Split Horizon DNS.
Requests from outside your network should resolve server.domain.com to the public IP, but requests from inside your network should resolve it to the private IP.
If that's what it is then you register the public IP with your nameservers. You also run a DNS service internally which you point all your computers at (likely by putting it as the DNS server in your networks DHCP settings). That DNS server is set up to return the private ip addresses for all your servers, and to forward any other requests to some external DNS like 1.1.1.1
I'm not sure what your use case or for needing to use the internal IP address from inside the network, but it might be to avoid traffic exiting your network just to be sent back in? Or you me a that you want external requests to go to one server and internal to go to another server? I'm which case the set up above still works, but on just use the appropriate IP addresses in the appropriate places.
Have a good day :)