font regenerator for copying restriction purposes on Deno

I am developing a web reader PWA primarily for reading CJK character text.

If I do not want users to bypass user select: noneuser select: none or other forms of copying restrictions in an F12 manner, is it an effective solution to randomly map all commonly used Unicode glyphs and CJK characters to E000-F8FF and F0000-10FFFF Private Use Area?

I don't think the mapping generator should be a big problem, most of the information I need is provided on the Wikipedia and Unicode official websites.

But how can I create a Deno based font remapper on the server?

I have searched a lot on this, but found nothing.