Ah thanks for the real-world check on AMD Ryzen and ECC. Sad state of affairs really, when so many things are integrated in the SOC, why skimp on this...
As for NUCs, I thought there were some Atom chips with ECC but not in NUC form factor ? Something shiny from Logic Supply might do then...
Closest you can come to a nuc with ecc is I think a mini server equipped with one of the four-core i3 parts that have ecc.