[pascoej]

You can get a recycled 512gb iPhone NAND for ~50USD.

You might have to copy the original SYSCFG (containing stuff like mac addresses, calibration, etc) to one of the new NANDs using something like http://www.jcidtech.com/product/product-86-806.html

All the iDevices (including laptops since at least T1) use the same NAND packages. Pre-iPhone 8 / T2 devices use a BGA60 package, while NANDs in devices after that use a BGA110 package.

For example, the NAND chip found in the iFixit teardown of the 2019 16 inch (TSB4227) is explicitly listed as supported by the programmer linked above: https://i.imgur.com/06a0KEg.jpg