If they only need to appear in the score then Shift-X text will work fine. Consider that when you copy and paste/alt-click/repeat a Shift-X item it will retain its properties even if you edit its actual content.
Typically my use case for this is the reverse: I have “V.S.” text that goes in the parts at tight page turns, but having set one instance to hide in the score I can Alt-click it around in any layout and know that it won’t appear in the score. If I then decide I want instead to show e.g. “(time)” - because there’s no space for rests before a page turn but a heap of multibar rests after it - I can alt-click an existing “V.S.” and edit it so it says “(time)”, and it still won’t show in the score layout.