I know it might look like people aren't being helpful, but you need to understand that every few months a person pops up and talks alot about their great hack plans. Then, about a month or two later, we never hear from them again. So, people are reluctant to put much work into a project that is potentially doomed.
So, what we are really asking from you is more than some name changes. Show us some artwork (even if it's just concept art, or just some sketches on paper)...show us the new level designs. Show us another hack that you've successfully completed... even if it's just a graphic hack of Mario Bros. And, if the ideas are good, people will help.
I could make you a text editor tool, maybe, but given my current schedule, it wouldn't be done till like end of 2017. As you see, I was having trouble even locating the text in the ROM...it takes a lot of time to do a project like that. I'd have to locate the offset of every line of text in the game, and program a way to convert ASCII input to the game's text table, make sure it doesn't overflow, game test every line. So, you can see why someone would be reluctant to do all that.
And when I say ask someone who knows, I mean PM them personally... these people have done the things you're asking about...
d4s - levels and music
ScouB-levels, text, graphics
Dirtbag-levels, graphics, music, text