I do plan to work on named parameters for C++, and have some others
that'll join the work, or even drive it.

You may be interested to know that I and a few others are doing the same: https://eisenwave.github.io/cpp-proposals/named-args.html

Our current draft is a bit stale though, and I'm not sure whether we even want to aim at having something by Croydon given that there are still some C++26 things left to do