Not really so close, though right? Using Laptopmedia's database, the only mobile ECC workstations are Xeon not Ryzen, and the minimum size for those are 15.6". 16:10 is the best ratio you can get for displays. In fact, AFAIK, there are no current COTS laptops with a 4:3 aspect ratio display at all.
I suspect if all of what you listed are actually hard requirements, the only way you'd ever get that is if you built your own - source an industrial 4:3 panel+controller, find the smallest Ryzen board with ECC support and get a Ryzen Pro APU (none of the ThinkPads will boot ECC SODIMMS on their boards, despite Pro APUs having nominal unvalidated ECC support) - you could try your luck with an A320TM or otherwise, might need to go embedded Epyc and an M.2 display adapter (like the SM750 ones). You could probably build a "tablet" form factor that's reasonably thin (<30mm?) and light (and use an external USB-C PD compatible chargers/battery packs and simple DC conversion to make life easier on the power side).
I suspect if all of what you listed are actually hard requirements, the only way you'd ever get that is if you built your own - source an industrial 4:3 panel+controller, find the smallest Ryzen board with ECC support and get a Ryzen Pro APU (none of the ThinkPads will boot ECC SODIMMS on their boards, despite Pro APUs having nominal unvalidated ECC support) - you could try your luck with an A320TM or otherwise, might need to go embedded Epyc and an M.2 display adapter (like the SM750 ones). You could probably build a "tablet" form factor that's reasonably thin (<30mm?) and light (and use an external USB-C PD compatible chargers/battery packs and simple DC conversion to make life easier on the power side).