This is a late response, but you can download this mod " [Deprecated] Echo's Sandbox Everywhere " Its basically zeus everywhere even in campaign, if you want only you to have it and your friends to not have it, you can share the modpack to them but remove the zeus mod for the modpack you going to share and thats it :)

if you want the link there it is : https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2081120309&searchtext=sandbox