I've discussed this with an old friend who is a retired truck engineer, and has experience of analysing wheel stud failures in commercial vehicles.  He says it can be a bit of a black art, as there are so many variables.  He's also advised me not to use these hubs, as if there is any error in positioning of the studs a lateral load can be placed on the stud as the cone in the wheel is engaged and tightened.  He's also advised me not to try to re-engineer wheel studs, as it's not as simple as it