What makes this tricky is that I believe these SSD's are AHCI interface, not NVMe. Also they aren't M-key so they won't even fit into the usual NVMe m.2 slot. There are outboard USB enclosures for NVMe m.2 drives but AHCI enclosures are rare and expensive, as you've found out. (There are other brands but they are priced about the same.)
If you have a computer that can read the HFS filesystem (either a Mac or a linux PC), and has an available PCIe slot, you might be able to make it work if you can get hold of an m.2 to PCIe adapter card that has the Apple keying. (I think this might, maybe, be G keying, but I'm not sure. It's definitely NOT the typical M or B keying.) m.2 to PCIe cards are basically just pin translators without any real active circuitry, so you might be able to find one for $20 or less.
Or, find someone with a 15" late 2013 who is willing to let you plug your SSD into their machine for a while. I'd offer mine except it's my work machine and I can't be without it.
TBH your best bet is to shell out for the OWC enclosure.