With pegs this is called an unbike, a phenomenon of the BMX world. Knowing that term you can find lots of posts and videos on this site and elsewhere. I discussed it on my thread Adventures in Peg Unicycling. @LargeEddie was an aficionado and I believe the picture of the gold-rimmed custom unbike on this page is his. I made and briefly rode this one (using the same drift trike fork as base that I used for my regular peg unicycle):
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