The answer itself:
filter = $tw.wiki.compileFilter("[tags[]!is[system]sort[title]]");
filter.call($tw.wiki);
which returns the array I need, was easier than finding the answer!
See this thread (Thank you Felix Küppers circa 2014!):
https://groups.google.com/forum/#!searchin/tiddlywikidev/compiled$20filters|sort:relevance/tiddlywikidev/aCRvcsVwfU8/9fXBg9WNmCcJ
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