R.I.P. My 2014 Macbook Air's SSD

From my research, I know the 2014 model Macbook Airs (A1465) contain SSDs that use an Apple proprietary PCIe 2.0 x2 interface.

I have also learned that the motherboard may also support PCIe 2.0 x4.

Otherwise, the SSDs are identical, but the latter SSD are cheaper and faster… so, my question is, has anyone successfully upgraded their Macbook Air’s SSD from PCIe 2.0 x2 to PCIe 2.0 x4?