Power PCIe card without motherboard?

I’m looking into building a DIY JBOD enclosure that is as small as possible, so I’m looking for a way to power a PCIe expander card without a full motherboard/CPU/etc.

Is this possible? If so, is there a piece of hardware that already exists for this?

Mining riser should work. They have an x16 slot and connections for power.

Example

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Very interesting option that I hadn’t considered, I’ll look into it more. Thanks!