A friend of mine have a HP Server Gen8 and it have a known problem, an EMMC fails due to some sort of bug in the firmware.
He want to replace it but if the issue shows up again its a PITA to replce the chip each time.
I was thinking if creating an dapter PCB with the same layout of a the BGA and than use a off the shelf emmc module would be possible:

So far i've only seen such tecnique in smarthphones Mainboard.
Do you think it would be possible?