Huh... Lemme try extracting the US tex.gfpk and see if it has any relevant files not found in the Korean tex.gfpk.
... Okay, I noticed something odd, but I'm not sure if it's useful. The US Sentinel _NR Files are actually yellow, instead of blue like the Korean _NR files or the US _NR files for other classes -- though there are scattered lines of the normal blue shade. They also have _SP and _NR files for costumes that don't have them for KSentinel or other classes.
I... just don't have any idea of what good this information does us.
EDIT: Oh, I know how to extract the files. You just have to run the Scarlet Blade script in Quickbms on a .gfpk file without using the -r switch -- directly double-clicking on quickbms.exe is the fastest way. I just have very little idea how to interpret the files I extract, and no access to most of the original Korean files to extract them.
EDIT2: Although, I suspect that if we can't figure out a way to work around the presence of _NR and _SP files for every Sentinel costume and armor in the US version, we'll be getting some weird results for costumes that don't use them in the Korean version, but do in the English version. We can't actually remove them from the gfpk outright without causing issues, and just setting up blank _NR and _SP files will likely lead to weird results in and of itself, so I'm really not sure how to approach this, beyond the tedious (and beyond my skills) work of extracting them from the US tex.gfpk, manually editing out the censor-related elements, then re-importing them.