We should distinguish the other nitroso compounds from nitrosamines because they do not require metabolism for diazonium ion formation. The mechanism is different at all. The surrogate should be selected from non-nitrosamines. The following thread helps you understand the difference between nitrosamines and the other nitroso compounds.
HESI New (Q)SAR/QM Nitrosamines Working Group will start a discussion on the other nitrosamine compounds.