Any consultation with a doctor to assess the donor hair in person? That may help give an accurate figure of how many hairs you may use for current procedure to future procedures. As for using chest hair or etc for crown or mid scalp, I think beard hairs would probably have better characteristics then chest hair. You can use it if you have limited donor hair for future surgeries.
You really have to plan this out carefully. You do not really know how much further the hair loss can progress. But if you got the money, and your willing to get multiple surgeries, then anything is possible.
As far as strip goes, I have no idea if it will be visible with that short hair. Some people can pull it off and some people it may show. You do not know how you are going to heal. It all depends on your physiology. But that hair is pretty short, so it may show. Check out patient photos and compare their scars and hair length.
Like others have said, I'd get on Rogaine/Propecia asap. Especially, since you are 24, it may work better. It can thicken your hair and help you regrow and conserve hairs. It's very important at this stage. The downside is some people may have side effects and when you stop using it, you'll lose what you gained. good luck