You'd have to define "truly independent" to attempt to answer. The Cockshut PTO had to rely on the tractor engine for power, so it's not really "independent" by the common use of the word.
George Berry built combines in 1883 (in California) that used one common steam boiler, one large steam engine for wheel drive, and one small steam engine for the "independent" PTO. There were similar versions in France also in the 1800s. I suspect, going by your use of the phrase, they were just as "independent" as the design used in the Cockshut. The use of the word "independent power shaft" showed up in early farm tractor patents for many PTOs, as long at they could be run "independent" of the wheel drive. Use of the word did not just apply to the type you mention.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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