If anything many of these PCs will enjoy a second life off eBay in someone's home-lab running Linux. One of the most popular "servers" in the home-lab community are those little Lenovo Thinkstations you see in hospitals.
Edit: if you're a sysadmin at a university, aren't you replacing machines every 3-5 years anyway?
It might surprise you to learn that 90% of computers sold are not-Macs: https://canalys.com/newsroom/worldwide-pc-shipments-q1-2025#...
The only reason most of these computers cannot run W11 is the graphic card, nothing more, they can have 16+ gigs of RAM, can be upgraded with internal 5G wifi cards for cheap, and yes, I still use ExpressCard PCMCIA extensions as well (to add USB ports for instance), or even docking stations!
edit: they are easier to repair as well or find parts for because the design goal wasn't to be ultra-thin or ultra-light.