I'm wiring up a new house and have sourced some CAT8 keystone modules. We are planing on using the PDL Iconic range for switches and powerpoints but i can't find any reference to keystone in their catalog. They did supply one for the old 600 series.
I did find this one here, but it doesn't mention keystone
PDL319MKC adaptor RJ Tyco Krone Siemon, 10Pk
http://www.pdl.co.nz/Trade/Products/ProductDetail?catno=PDL319MKC
Though it does look quite similar to the PDL615MKC which does say it's for keystones
https://www.se.com/nz/en/product/PDL615MKCWH/keystone-data-jack-clip%3B-white/
Someone must have attempted this before?