As suspected, the consensus-and my decision-is that I will pull all of the brake lines and replace them with new parts. Hard lines and soft lines will all be replaced. Otherwise, I will spend days/weeks/months chasing problems like the monkey around the Mulberry bush. To that end, I placed a few orders last night/today to ensure that I have all of the pieces I need to replace the entire braking system. I found the proper front and rear pan grommets for the main line from front to rear today.
All that remains is finding the location where 'desire' and 'time' intersect.