OP wants to access data on the old SSD.
Important files can be more important than the money spent for a one-time use...
OWC does have a decent solution with the Envoy Pro enclosure, but, yes, a bit pricey.
Experience incredible portable performance in the palm of your hand. The OWC envoy Pro combines elegance and functionality in sleek, portable external storage for Apple flash SSDs
smile.amazon.com
(Important files? I would probably recommend getting that OWC part... )
I have an Apple card-to-PCIe m.2 adapter.
XtremeAmazing HDD Hard Drive Converter to PCIE M2 Adapter Card for MacBook Air Pro Retina A1465 A1466 A1398
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Your Apple card plugs in to the adapter, and the adapter then plugs in to a standard m.2 card connector, which might be an external PCIe m.2 card enclosure. You wouldn't need that adapter card if you get the (albeit more expensive) OWC enclosure. The Apple-connector card would just plug right in to that one.