hello,
i released the version 7.5 of Scheme+ for Kawa.
https://github.com/damien-mattei/Scheme-PLUS-for-Kawa
it contains a few examples in this directory:
https://github.com/damien-mattei/Scheme-PLUS-for-Kawa/tree/main/examples
Also released is some versions for Racket and Guile on my github.

Regards,
Damien