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I think you just gotta write the actual note values you want and put each addition on as a new layer. (see cygnusdei's image). There's nothing wrong with that notation - it's not un-pianistic (it's all over the well-tempered klavier). Using sustain pedal notation wouldn't do it, I don't think, because that still implies that you take your fingers off the keys, and that would make it impossible to do the rest of the notes in any other articulation. I've never seen the "tied to nothing" notation in any music.
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