I’ve always thought the Radio Gnome era Gong had something in common with Sun Ra’s Space Mythology and early 70s Cosmo Drama band that toured Europe. I’d go as far as calling it a template. Similarities? Space chants, mythology, extended improvisations over core themes, costume, instrumentation (to some extent, such as sax, flute, added percussion, Moog), and eccentric leadership. In France both bands appeared on the same label, BYG/Actuel, and appeared at the same festivals. One thing is certain though, the influence would have been one way. I can’t imagine Sun Ra being influenced at all by rock.
If I hear Miles in Gong it would be something like Calypso Frelimo from Get Up With It - almost space rock. I’m sure someone like Didier Malherb would have been well versed in Miles, Coltrane, Joe Henderson, Wayne Shorter, Ornette, John Gilmore etc etc........and Daevid Allen likewise the New York avant Garde, esp Riley, Conrad, Young, Cage etc......an interesting melting pot to say the least. As it should be.