That's the thing, though - it's pretty clear that the market for creative work has too much supply and too little demand for it to be well-funded for everybody who wants to participate. Any arrangement that you make to change that is going to be welfare in disguise; so why not just be honest with ourselves, and spell it out? Let people have UBI that's good enough to actually live on - and then they can do creative work that they want to do, without having to worry about how they'll sell it.
As David Graeber put it, people need an "out". UBI is a good out, but well-funded meaningful creative work is another potential out for at least some people.