Idea

NCR could have a "confirm twice" option, described as

If the server requires signing, every chat message needs two Enter keypresses to be sent.

Reasoning

Just like it provided a privacy protection to chat preview, it would provide some "think twice"-esque protection for chat signing. This would not apply for commands that don't require signing (if possible to determine).

Other Information

The code could be directly taken from 1.19.2 chat preview's "when sending" option, even though chat preview itself was removed with 1.19.3.

It's my personal idea that it is disabled by default.