I don't think it would break, when you see other older doll manufacturers ideas of suspending a doll with a 2x M6 bolts spot welded to each end of a thin piece of flat metal and they will hold a doll up for months, I am sure that will be alright.
TBH several of my TPE and Silicone dolls have the M8 connector in their backs, the IT RLD I have on order I made sure that had one too, unfortunately my four stands take up half my house the legs project out 2ft, they are a early morning toe stubbing nightmare, KK's stand is very compact.