Of course, I can do any possible(1) or impossible(2) thing - it’s just a matter of time and money - … but you have to wait for miracles(3). 
This task is in the category (1). (without the “second matter”…
)
But first of all, I would like to point out that you can also assign a keyboard shortcut to the original Extension meus - to all or just that one you mention, so you can quickly access it without using menu or Toolbar…
You need to create at least 2 scenes and select any or many Drawing elements then the first 4 menus/icons will be enabled. Then you can assign a keyboard shortcut by: Windows>>Preferences|Shortcuts and add shortcut e.g. to ‘Hide on all Scenes’
.
If you still prefer the reduced menu, here are that version of plugin:
Dezmo_scene_visibility-2024_01_28_0915.rbz (63.7 KB)
You can install it without removing the original, but you must restart Sketchup to take affect!
(BTW: You can also reinstall the original one without removing this one too…)
You will have
- only one menu item below Extensions (‘Hide on all Scenes’) so you still can assign a shortcut to it
- You will have a second Toolbar containing only one command for above menu
- You will still have the originally toolbar - just in case - but you can switch it on/off… to do not disturb you.
- You will have context menu (right click on selected drawingelements)
Hide “original big” toolbar if you want:
Right click menu:
The “Notes” from the first post are still apply!