Happy to help!
Would you say the best way to go about things is submitting the Musescore PDF, the .mus file people in the help tab give me, and the MIDI to the NSM Panel, then reply to that submission with the Musescore link, and then resubmit with the updated PDF and/or .MUS files?
So far as my understanding, no. As I said in my previous post the submission upload is kind of expected to have everything from Finale, so you will need help for all of the files. If you know anything about virtual machines, maybe you can run one on your mac and create a virtual windows os? Then you could use NotePad there idk if that's the most efficient method.
I would recommend you use the site discord if you aren't already up there when it comes to asking for help; you're going to get a response within minutes there whereas it's a lot less likely someone will reach out on the forum.

I was going to help you with War Chronicles, but I had this error. If someone has Finale and not Notepad, they should be able to fix this. I am not sure how to tell Notepad that the snare and piano are the same instrument.