Thanks a lot for the discussion and your comments.
So am I right with the understanding that the idea is a ‘no-go’?
You (or a champion) then need to present the formal proposal to WG21 at a meeting, likely the EWGI subgroup which deals initially with language extensions. They will then discuss it and take a vote whether they want to consider working on it.
I'd start by writing a draft of the formal proposal and then posting the draft document to std-proposals. We can let you know the next step once this is done. For examples of other proposals see https://wg21.link/index.html