An alternative method to do this is, that there is a “planning mode”. A planning mode is like placing ghosts, but the robots don’t build it, you actively need to change the state of that from planning to ghost.

See
https://forums.factorio.com/viewtopic.php?f=80&t=4682 Planning (Signs, Cloning ...

TL;DR
switching on and off the roboports.

What ?

It would work pretty much like switching on and off the inserters with the circuit connection and like personal roboport switching.
Basically, the robots are coming to their roborports and don't leave them when the signal is on.

So I thought ...

Well you can turn of your personal bots.
Otherwise maybe use a blueprint they can't build yet - like use level 3 assemblers, blue belts etc and use an up(down)grade planner when you want them to build?


It limits the gameplay too much for me. My best idea is to don't store any items in the ...

I couldn't find any mod for that, except this outdated one:
https://mods.factorio.com/mod/dont-touch-my-ghost

Also, I saw a suggestion on the same topic from 2017, but don't know if it was completed.
https://forums.factorio.com/viewtopic.php?f=6&t=48983

I wonder if it's really possible to stop ...