A few problems concerning CTRL+ALT+DEL & ALT+F4.

Hello @W10 Tweaker,

W10 Tweaker said:

Have you attempted to add the Switch user option via setting it as the default setting using Sergey's tweak?

I do have to ask though, is the Switch user disabled in power settings or anywhere else that you know of?

Yes I have, it didn't work!
The re-image is pure, without any REG Tweaks etc!
Are you talking of anywhere specific?

W10 Tweaker said:

Just asking about any potential tweaks that could be influencing the results here, it sounds unlikely if there are no tweaks.

I will have to continue this exploration later, I have a training course this afternoon to prep for. Keep us posted on any new developments.

Thanks, and I will do!

Well I bit the bullet and asked @Brink [the Master] if this was achievable.

Unfortunately it is NOT possible to just have the Switch User option available solely on the ALT-F4 Menu because it is a Global Setting.

So what I did was, run . . .

Enable or Disable Fast User Switching in Windows 10

. . . which added Switch User to the CTRL+ALT+DEL screen, which I DIDN'T want, but, it also added it to the ALT+F4 screen which is what I DID want. Fortunately, it DOESN'T appear in the Start Menu which is good.

So basically, I have got to live with it being on the CTRL+ALT+DEL screen?

One bit of added information, after adding the above the Administrator appeared back on the Start Menu!

I also asked @Brink if it was possible to DISABLE or DELETE the CTRL+ALT+DEL screen but he isn't aware of anyway that can be done!

So with that in mind, I am going to mark this thread as SOLVED.
Thank you to EVERYONE who has contributed their time and effort, it is appreciated.