Rich Text Editor - Redactor X, super simple configuration

I’m trying to create a super simple configuration for the Rich Text Editor, based on Redactor X in EE7.

I want three buttons - Bold, Italic and List.

I can have Bold, Italic and Format, but I only really want list rather than Format. I could probably fudge it by changing the icon for the format menu, which in this config only has paragraph, unordered list and ordered list. (We use this field on the front end so I want it to be as simple as possible.)

Can anyone help me with how to update my RTE config JSON file so that the LIST button appears?

Here’s my Superbasic config:

{
    "toolbar_hide": "y",
    "hide": [
        "html",
        "deleted",
        "link",
        "format"
    ],
    "sticky": "n",
 "toolbar_topbar": "n",
 "toolbar_addbar": "n",
 "toolbar_context": "n",
 "toolbar_control": "n",
 "toolbar_reorder" : "n"
}

I’ve tried adding in “list” in various places where I would think buttons could be added:

{
 "toolbar_hide": "y",
 "toolbar_topbar": "n",
 "toolbar_addbar": "n",
 "toolbar_context": "n",
 "toolbar_control": "n",
 "toolbar_reorder" : "n",
 "sticky": "n",
 "hide": [
  "html",
  "deleted",
  "link",
  "format"
 ],
 "topbar": [
  "shortcut",
  "undo",
  "redo",
  "list"
 ],
 "addbar": [
  "paragraph"
 ],
 "context": [
  "bold",
  "italic"
 ],
 "editor": [
  "bold",
  "italic",
  "list"
 ],
 "toolbar": [
  "bold",
  "italic",
  "list"
 ],
 "format": [
  "p",
  "ul",
  "ol"
 ],
 "plugins": []
}

But it never seems to make any difference.

Another couple of quirks - I can’t seem to override Reorder using the JSON. I can do this by modifying line 65 of RedactorXService.php

$config['toolbar']['reorder'] = false;

Also,

"toolbar_hide": "y",

seems to SHOW the toolbar.

"toolbar_hide": "n",

seems to HIDE the toolbar. Is this expected behaviour?