I know it is possible to implement B31J using FEATools. However I find that a time consuming way of converting your model, especially when I am dealing with a model which needs a lot of engineering to get the stresses and nozzle loads OK.
If it is native in CII I suspect it to work a lot faster.

My "complaint" as you call it is more general. CII isn't updated to the lastest version of the code when the code becomes effective, basically meaning we cannot say we have a code compliant calculation.
It is not a complaint by the way, just an observation that development is not up-to-speed with code updates.