Well you’ll have to get very creative to explain how a former Galactic capital home to trillions is now an unreachable MacGuffin (unless you get rid of the wayfinder hunt subplot somehow).
My plan is for the Sith Eternal being underground in the Sith Temple deep below the Jedi Temple. The city is intact and the planet is not hidden. It’s just no one realizes it’s Exegol.
Doesn’t sound very feasible. And from what I remember, didn’t this whole conversation start with you criticizing someone’s prequel ideas for being unfeasible? Ironic.