i'm not aware of a GPU implementation of the pubkey derivation function, but i'd be very pleased to hear that an opencl version exists

it's kinda incredible that it hasn't happened sooner, elliptic curve keys are basically becoming the norm these days, on SSL/TLS, on SSH, basically all cryptocurrencies use them, either ECDSA, ED25519 or Schnorr

minting vanity keys is now definitely a big thing