Does the PCIe x1 m.2 adapter work? Yes, but there are some downsides.
2 Port M.2 SSD to PCI-e x1 adapter B or B+M key (SI-PEX40115) : Everything Else
Pcie 2.0 X1 Ssd Hot Sale, 56% OFF | www.ingeniovirtual.com
PCIe X1 to MSATA SSD + SATA3.0 Expansion Card PCI Express Mini ATA SSD Adapter - Walmart.com
NVMe PCIe M.2 NGFF SSD to PCIe x1 Adapter Card PCIe x1 to M.2 Card with Bracket PCI E M.2 Adapter for 2230 2240 2260 2280 SSD M2|Add On Cards| - AliExpress
Apricorn Velocity Solo x1 Performance SSD Upgrade Kit for Desktop PCs and MacPro Serial ATA600 PCI Express 2.0 x1 Plug in Card 2 Total SATA Ports - Office Depot
SYBA SY-PEX40039 2 Port SATA III PCI-e 2.0 x1 Card - Newegg.com
Pcie 2.0 X1 Ssd Hot Sale, 56% OFF | www.ingeniovirtual.com
ICY BOX IB-PCI210 2x M.2 SATA SSD auf PCIe 2.0 x1 - Schnittstellenkarten | Mindfactory.de
Nvme Pcie M.2 Ngff Ssd To Pcie X1 Adapter Card Pcie X1 To M.2 Card With Bracket Pci-e M.2 Adapter For 2230 2240 2260 2280 Ssd M2 - Add On Cards & Controller Panels - AliExpress
Mini PCI-e WAN WiFi to M.2 NVMe SSD Conversion Card Extender Adapter PCIe3.0 X1 Full Speed (30cm,R64SF) : Electronics
Amazon.com: ICY DOCK 2.5” SATA SSD/HDD to PCIe 2.0 x1 Hot-Swap Mobile Rack for PCIe Expansion Slots | ToughArmor MB839SP-B : Electronics
M.2 NVMe SSD to PCI-E 3.0 4x/8x/x16 Adapter Card Converter for M Key P – RIITOP
PCI-E 3.0 x1 Lane to M.2 M-Key SSD Nvme AHCI PCI Express Adapter Card PCIE SSD 702380045458 | eBay