I don't think nolva will help w/deca.aromatization.Nolva takes place in to the receptors sites for estradiol.Deca aromatize in to progesterone.
Th only 2 things you can do are taking winny or arimidex.
This isn't a flame or anything like that, just to make everything clear
There is nothing called aromatise in to Progesterone
Aromatization is a process in which it take place with the Aromatase enzyme when a 19-carbon steroid hormone passes throw the Aromatase Enzyme (Cytochrom-P450) it converts to Estrogenics compounds including Estradiol and others
so, there is nothing called Aromatising to Progesterone
secondly, Deca-durabolin do not converts to Progesterone, it classified as a Progestin(19-nor progesterone derivative) (a hormone with a Progesterone like effects) and there is a very big difference between both
19-nor progesterone derivatives as Norgestrel as an example used as a birth control pill for preventing ovulation While Progesterone as Primolut used for women to get fertilize and helps in ovulation!