It's not just a matter of changing those lines. There needs to be code added so that it only changes the cash out window and the rewards system after the hard fork. Things before the hard fork have to still be calculated the old way, otherwise it will break the blockchain. That's why you need someone who knows how to code a hard fork correctly.
The whole system would need to be revamped in order to make the posts evergreen. Right now it's based on a cash out window.
It would need a lot of careful thought from people who are competent in the subject. That would mean someone who is proficient in C++ and is well versed in how blockchains and economic systems work.
I understood that when I looked and found it. I was trying to help isolate the code for whoever is capable of writing what needs to be written in its place.