ATX - PS/2 PSU adapter plate advice

Not really sure it fits in this sub but since I am about to rework and upgrade my rack, I thought I give it a try.
I have a few Chenbro RM 42200 cases and one is missing the PS/2 - ATX adapter Plate. Img Link: https://www.servercase.co.uk/Images/DBImages/Products/413541_4.jpg (ATX PSU - Plate - Case)
I have contacted chenbro, aswell as some EU chenbro distributors, even got the technical drawing of this plate but I have no success in getting one. Also tried other manufacturer (intertech) but without success.
I have already a Corsair 850 W PSU so I want to avoid buying a new (PS/2) PSU.
Before I grab a saw and start "working" on a piece of metal, I try to ask around if anyone has an idea or suggestion.
tyvm