I was one of a loosely associated group of misfits. I had friends who were into punk, new wave, and the neo-mod/Two-Tone thing, in varying ratios.
As far as the mod concept crossing the Atlantic, it was superficial, in that it was limited to fashion and music. We were divorced from the socio-cultural factors that led to the mod movement in the first place. So I guess I was engaging in cultural appropriation.
As for the film of Quadrophenia, midnight movies were a big thing in the US in the late 1970s and early 1980s. These would include any kind of youth culture film, directly or indirectly. Films like A Clockwork Orange, The Man Who Fell to Earth, and all kinds of concert films from Woodstock on down. Even at that age, I would set my expectations low for rock films, as many of them struck me even then as cash grabs. I first saw Quadrophenia at one of these showings, and it exceeded my expectations in terms of writing and production values. I don't know if it got a "big" release in the US, but it was ubiquitous for a few years on the midnight movie circuit, and the soundtrack album was everywhere, including the cutout bins.
I haven't seen the film in decades, but writing about it here, I'm tempted to revisit!