So, wrapping WSGI in FCGI or SCGI would feasibly be an option but the most popular project there – flup – is so old that even it's "new" python 3 port (flup6) is already so old that the repo isn't reachable and the last update was in 2015.
Apart from that, there only seem to be wrapper projects with like 5½ commits and a bus factor of "author might have already been swallowed by the earth". :thaenkin: