Take that part out because otherwise you're going to make a promise that you can't keep. And honestly, I wouldn't send them a letter. I've done all my negotiating by phone. My mother sent a letter, and she is a senior citizen living off my dad's pension and barely making ends meet. They rate jacked her just because, and were unsympathetic and refused to reinstate her original rate. Sending a letter does nothing - they do not recognize good faith. Good faith to them is paying whatever they ask for on your due date, no matter what the agreement was when you opened the account.
I told them all about my hardship before I ever missed a payment, begging them to honor the original APR and they were not interested. I also talked to them all about once every week or every other week in the beginning. It did not help and was very stressful repeating my hardship story over and over. If I were starting all over again, I would have still called & told them about my hardship first, then not answered at all until 3 or 4 months of nonpayment. If you don't want to change your numbers, get another number and give that to your friends & family and turn the ringer off your regular number. Once you miss your first payment they will begin calling the very first day at 8:00 a.m. and continue until 9:30 - 10:00 p.m. and will continue for 6 months.
Prepare yourself now with a plan and read everything you can on this site about BOA and Citi, taking notes if you have to. Call them about your hardship, turn off your ringer and try to forget about them for 3 or 4 months. Make sure you can feed yourself and your family and stay warm this winter!