Would you consider having an LPDDR4x/5 option in the future? I know it breaks upgradability and repairability for this one part, but as there is no GPU with dedicated memory, having higher RAM bandwidth could be beneficial for running (simple) games. I think RAM is the one part where breaking upgradability has actual real benefits.
Of course this would be in addition to the SO-DIMM version, so I guess it would require you to design two different motherboards.