I guess the best way is to built that “unraidable” base on another world where you don’t kill the bosses.

Best would be to just modify an offshore island to your wishes, make sure nothing can spawn there and never kill a single bat so that the bat event doesn't start. After that, no raids seem to activate, except for the drake event which you MIGHT see once before you kill Moder, i have literally never seen it in my life.

Edit: screenshot
https://steamcommunity.com/sharedfiles/filedetails/?id=2900661844

island base is the best , every raid r way easier than usual , u just have to shoot the enemy in the water while they swim around