> Invented languages are overwhelmingly boring in their likeness to English, Spanish and other Western languages.
Toki Pona is not like English, Spanish, or other Western languages.
It has no singular/plural distinction. It has no past/present/future tense. Its pronouns have no gender. All of its phonemes are present in almost all languages (this is on purpose). The way it forms questions is not like Enlgish (I don't know of any language that it's similar to). Its word order is subject-verb-object, like most languages. [EDIT: not most, only 42%]
The only thing its taken from English, as far as I've seen, is a bunch of vocabulary. Though honestly its sounds are so limited that sometimes you can't recognize which English word a Toki Pona word came from.
> What if we tried to create, say, a language with a logographic written system that is pure WYSIWYM (as opposed to “what you see is how you pronounce”) and synthetic to boot?
I'm not sure exactly what you mean, but I'll just leave this link here...
https://omniglot.com/conscripts/conlangs.htm
> Instead of borrowing around, use a random seed in generating a minimum set of unique basic “native” words according to language rules and build on top of that
Lojban does this.