Thanks. Yes, that's the sole proprietorship thing. Lowtax says you can do it as a foreigner.
When I was considering setting-up activities in Taiwan (before finding out it's not the best idea), it seemed like the cheapest thing to do and the closest status to a "freelancer status" or a "business in as a natural person", but I never found anyone who set-up a sole proprietorship, nor had information/costs about that from services providers.
If people here made a sole proprietorship, I'd be curious to hear about their experience, incl. admin costs.