Using CMD as the default shell

It has been brought to my attention that by using the registry, we can change the default shell from explorer.exe to, say, powershell, or the command prompt. I've been having a lot of fun with this, as I've always wanted an operating system similar to DOS, but where you could execute modern 64-bit programs. This is very similar to what I wanted, but not quite, as the Command prompt does not support full-screen as we all know.

I wanted to know if there are other shell programs I can use besides explorer, CMD, or powershell. Maybe different shells that one can download off the internet as thought they were Linux desktops such as GNOME, KDE or Xfce?

P.S: The Registry key I'm referring to is:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

Maybe I'm misusing winxshell, but it looks like a bad copy of the windows 10 shell. You said there are numerous explorer replacements we can use, but I was wondering if there aren't any shell replacements. WnxShell is certainly one, but it looks very bad and again, just like windows 10. What else is there?

Takes me back to the good old days when there was pctools and Norton desktops

SIW2 said:

shell-replacement-programs

Now that is more of what I was looking for. Thanks!