Thank you! Even without it being specifically legal advice, it helps having the experience of someone else in this ecosystem. Are there any articles or pages on Unreal or FAB related to allowances or encouragement for the modifications?
I saw that there are options to release animations and videos as well but not the “asset” itself, obviously. I’m also fine with buying the higher licenses IF I actually make money with anything, but for now I live in fear of DMCA because my free game might break the “reverse engineering” because I changed a mesh.
I have this, along with many others in the “personal tier” I believe, as opposed to the higher tier:
https://www.fab.com/listings/15f9685d-89e8-411d-99e2-fc22e0567147
From a humble Bundle. I try to read through the EULA and licensing and had to forgo some bundles from other asset providers for some weird parts, but Unreal’s was so close to what I needed that it was still usable even if everything above was a “no.”
I wish I could afford a lawyer that also had technical knowledge in this field 
My field is computers and IT, and I have had to help and know usually lawyers need a lot of (billable) help to understand nuances like the “reverse engineering.” I also asked a visual effects expert that works in Unreal that does have a lawyer and he still didn’t quite know the exact parts in those lines:
i. attempt to reverse engineer, decompile, translate, disassemble, or derive source code or data from the Content;
That was the main issue, considering the move to Blender is likely a “translation” between formats. I’m unfamiliar with visual files like this, though. New industry
I am glad there’s specifically a line that allows animations to be made and rendered for film etc… projects. I am more familiar with Blender than Unreal for that though.
i. rendered video files (e.g., broadcast or streamed video files, cartoons, movies, or images) and
ii. images created using Content.