Finished normalizing everything. Went with Blah's suggestion of "Shinsekai" because I'd take his word over mine any day. Some specific notes:
Turns out there were only three credits to "SNK Sound Team," not four. The fourth said "SNK Sound Team" but then gave full arrangement and performance credits.
KOF Maximum Impact 2 Soundtrack gives "SNK Playmore" as a composer, so that's another legitimate alias.
NEO GEO DJ Station in Gemudora night ! doesn't have any composition or arrangement credits in the scans, as far as I can tell, but
the back cover does give "SNK新世界楽曲雑技団" for two things I can't read, as well as a qualifier for the member Konny. Since it's the only album I saw that actually had "SNK新世界楽曲雑技団" in the credits instead of "新世界楽曲雑技団" for
anything, I went with "SNK Shinsekai Gakkyoku Zatsugidan" as an alias.