You could have a two-stage process. Stage 1 would be the proposal, where you have the discussion on whether the feature is desirable or not, which can then be provisionally accepted. At this point it is not in the standard.

Then you have Stage 2, which would require an actual working implementation, so it can be properly tested and such. Acceptance in Stage 2 would result in the feature being in the standard.

Great, languages like C++ relevance on the industry, should have a "you should be this high to play" entrance price.

Also I should add this is no different on wannabe C and C++ replacements, or most other programming languages with similar market share.

Go try to do a drive by pull request for a new language feature on those ecosystems.