Rick Wakeman (famously of Yes) was a classically trained pianist, and often slipped snippets of classical music into his solos or did homages in his writing. He did an aloof classical variations, but I think it was played mostly on piano.
OTOH, Jon Lord (Deep Purple’s keyboardist) also drew inspiration from classical music, but always preferred synths, electric organs, and rock arrangements even in his solo work:
OTOH, Jon Lord (Deep Purple’s keyboardist) also drew inspiration from classical music, but always preferred synths, electric organs, and rock arrangements even in his solo work: