Just had a look and cant see anything that fits your criteria.
This is the closest.
https://www.overclockers.co.uk/ocuk-gaming-empath-amd-ryzen-7-5800x-gaming-pc-fs-1ey-og.html
If you call them I doubt they'd mind putting any pre-build in any case (size permitting), it's not like they use a standard case for Intel or AMD.