The Dell Optiplex community did this a few years ago and they were even able support older generations of Optiplex. The actual NVMe boot module is pretty generic and I’d suspect it would work with other machines.

https://tachytelic.net/2021/12/dell-optiplex-7010-pcie-nvme/

https://tachytelic.net/2022/02/dell-optiplex-790-990-nvme/?a...