++++Replace ALL the coolant hoses. Buy 6-8 feet of vacuum hose and change that too.
I don't think your plan is overboard. It's smart. What is peace of mind worth to you?
Just be VERY careful with your heater hoses. Carefully cut them with a razor blade until you can gently pull them off. The tubes are soft copper so you can find yourself in need of a new heater core if care is not taken.