Wow, maryjk, thanks for all the leg work!
YADA, it’s precisely Mrs. Hahn’s book which spurred my interest. In her chapter on sterilization, one couple didn’t get the vasectomy reversal, perhaps for financial reasons, but continued to use NFP and abstain during the fertile phase so as not to ‘enjoy the benefits’ of this time. This may be the approach I take. I must confess, I was looking forward to ditching the charts (partially out of hurt feelings), but I know I am being called to do what I know to be right and continue to chart my cycle and judiciously discern and abstain during the fertile phase.
My GF who’s unable to conceive and has ditched her chart says she and her husband basically just pick one week a month to abstain. Praying I can persevere!