We cannot definitively identify this artiste.
Possibly the recording engineer, with real name George Chkiantz and alias Irish O'Duffy.
From Discogs: "George Chkiantz was a recording engineer and producer in London, England. Chkiantz was engineering the Small Faces 'There Are But Four Small Faces' at Olympic Studios at the same time as the Jimi Hendrix Experience was recording Axis: Bold As Love. Chkiantz engineered the Small Faces' "Green Circles", which was the first use of MONO phasing on a record of popular music. Hendrix and Kramer applied Chkiantz's concepts and utilized STEREO phasing on "Bold As Love" and "Little Wing". Other credits include engineering on Led Zeppelin's 'Led Zeppelin IV' and 'Physical Grafitti', Blind Faith's only album, along with several King Crimson albums. He traveled with Brian Jones to Morocco in 1968 to record 'The Pipes of Pan' at Jajouka by Master Musicians of Joujouka, regarded by some as the alpha recording of the World music movement."
However Chkiantz is white and seems not to have worked in the same field of music as all the other names on the Hackney plaque.
