ASUSTOR looks interesting but none of their desktop units appear have PCIe expansion slots so you can't put a SFP28 card in there. It might be possible via expensive USB4 adapter.
You can either forego NVMe slots (which looks like an add-on card on [0]) and get the slot, or use one of the USB4 interfaces. OTOH, it has 2x10GbE on board, you can just media-convert it.
That box is "just" an I/O optimized PC which can boot without a GPU.
Older hardware with Intel processors have an iGPU on board. You can use the HDMI output on these directly.