For those who don't need quite that much power I recently added an Orange Pi 5 to my own homelab, the RK3588 SoC packs an impressive punch for what it is
And despite their broadly similar performance, the RK3588s have significantly better power draw.
However I’m not sure of any of the rk3588 vendors that support both UEFI and have a full-size PCIe slot like the MS-R1 has.
Similarly, a Beelink mini runs one of my Proxmox nodes and it's excellent. Literally sips power, too. I think I measured under 30w while under load. I mainly use it for my Plex instance given the N100 with QuickSync.