Maybe get som Tai Hao sets and mix and match them? Not sure where you can get the 1.75x right shift, though.
AFAIK, the only ones with 1.75x right shift are Cherry profile.
If I were you, I would get a full GMK set that you like (say Dolch perhaps) and then those GMK mods that SpAmRaY linked to. You won't find higher quality keycaps than those!