It seems the idea was the artitst's own, as part of an exhibition he was planning for Denmark.
https://www.msn.com/en-gb/news/uknews/royal-artist-recalls-fun-and-sparkle-of-the-duke-of-edinburgh-at-portrait-sitting/ar-BB1fwzz2
There is a little more information here.
https://www.ralphheimans.com/portrait-of-hrh-the-duke-of-edinburgh/
RW1412
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