If your question was about the mechanism of wrapping runsv:

 mv /bin/runsv /bin/runsv.real
 cat > /bin/runsv <<EOF
#!/bin/sh
exec local-reaper /bin/runsv.real "$@"
EOF
chmod 755 /bin/runsv

 Of course, the best solution is still to do nothing and forget that
subreapers are even a thing. (And also to switch to s6. :P)

--
 Laurent

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