In the libreoffice project, we have implemented some of this eg. no c style casts, using clang plugins, which avoids needing a custom build of clang. But always good to see people experimenting in this space!
That's great to hear! I'm sure I could find it, but are the libreoffice coding standards written down (and could you send them my way)?
On the topic of coding standards, there's an excellent github repo https://github.com/isocpp/CppCoreGuidelines which even quotes Bjarne Stroustrup as saying "Within C++ is a smaller, simpler, safer language struggling to get out." There are hundreds of recommendations, like 'ES.31: Don't use macros for constants or "functions"'.