Have you considered Guiseppe's proposal P2591?

https://github.com/cplusplus/papers/issues/1249
 

-----Ursprüngliche Nachricht-----
Von: Frederick Virchanza Gotham via Std-Proposals <std-proposals@lists.isocpp.org>
Gesendet: Fr 01.09.2023 11:49
Betreff: [std-proposals] std::string::operator+(std::string_view)
An: std-proposals <std-proposals@lists.isocpp.org>;
CC: Frederick Virchanza Gotham <cauldwell.thomas@gmail.com>;
We need:

       string string::operator+(string_view)
       string &string::operator+=(string_view)
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