What you're actually looking for is a TUI text editor, usable on x86/64 Microsoft Windows, that adheres to the Common User Access derived interface conventions for keyboard menu shortcuts, such as Control+Insert for "copy" Shift+Delete for "cut" and so forth. And what you're discovering is the reason that the Common User Access specifications and their derivatives came to exist in the first place: In the (IBM PC Compatible) world before OS/2 and Windows, when everyone rolled their own TUIs rather than used IBM-supplied/Microsoft-supplied GUI engines, there were no globally accepted keyboard commands for editing actions, or even for simple cursor motions.
Unfortunately, and especially in the world of TUI text editors whose origins lie in Unices and Linux (which includes, as you've seen, clones of the
pico editor from Pine), that situation continues to this day. In that world, we're still stuck in the age where there were devotees of the WordStar control keys versus devotees of the WordPerfect control keys, except that it's now vi-versus-emacs-versus-pine-versus-brief. It's almost as if CUA and the user interface developments in the IBM PC Compatible world since the 1980s didn't exist.
Of course, the reason for this is the success of the GUIs, which adhere to the CUA conventions. If you want a text editor with CUA-compliant keyboard shortcuts, there are GUI text editors galore. (You can run
notepad myfile.txt from the command line, for example.) But few people have rolled their own CUA-compliant TUIs to make TUI text editors with CUA keyboard commands, and those who did were mainly the corporates who now no longer sell such products and have shifted to selling GUI tools.
However, some (almost) CUA TUI text editors are still available as native Win32 TUI programs, including ones built upon Turbo Vision (which is close to, but not quite, CUA) such as SET's Editor.