Bring back the veggie patch.
Many years ago I used to deal a lot with a big national telecommunications company. Over the years I eventually found out why sometimes things would get done and other times things would take forever - they had an ecosystem within their organisation called the "veggie patch" where all the not-so-useful and not-so-effective people would be sent. Best of all it was already brimming with diversity.
I've since concluded every big organisation needs a veggie patch. It also ticks a box.