Thank you very much Mike. I am glad that you find the tablet prints satisfactory.
As you have said this method would extend the range of papers usable with argyrotype,the new cyanotype, and pop pt/pd. I haven't tested it but I believe SA treated papers would work well with all of the siderotypes. To me if it works with the new cyanotype and the argyrotype it would work with anything. Loris tested pop pd and it works with that process too.
I believe this might be especially helpful when learning/practicing and probably at teaching alternative processes. SA treatment opens up a whole range of commonly available and affordable papers to work with, not that they can replace alkaline and acid free hand-made papers.
I have prepared the new cyanotype samples using initial 1 min wash in %1 sulfamic acid, the results were so superior to initial citric acid wash IMO.