On Linux text I select is automatically placed in a buffer, which gets pasted anywhere with a message ddle click.

That bypasses all the copy restrictions.

xfce4-screenshooter, the default on Xubuntu, has the ability to open it with a program. So download any OCR program in Linux,say tesseract.

Make a script tesseract $1 | xclip -sel c save it as scrocr

And choose this program in xfce4-screenshooter, it'll remember it for next time, keeping the drop-down menu short.

This one copies to clipboard, if you want to view it first, then pipe it to `zenity` or `yad` instead of xclip, one of which im pretty sure is pre-installed in ubuntu. And you can copy it out of there normally after checking it.

If you use gnome etc and not xfce, check comparable options in gnome screenshot tool

Also, you need to use wl-copy instead of xclip on wayland