You might be able to. You just need to make sure you get a compatible module somehow.
I wonder if 3rd parties will start selling them. If the memory controller is in the cpu, there’s no reason for the little board housing the ssd to have any proprietary chips…
Depending on your level of price sensitivity, you can always use a Thunderbolt SSD, an external RAID array of SSDs, or just get the 10 Gigabit Ethernet upgrade and hook into local NAS.
I wonder if 3rd parties will start selling them. If the memory controller is in the cpu, there’s no reason for the little board housing the ssd to have any proprietary chips…