if going with the GK64, i'd stick to what looks to be compatible on their site.
https://kbdfans.com/search?q=GK64There are other hotswap 60%s HS60, a hot swap version of the GH60, GMMK, etc...
i see now on the GK64 why the 2u left shift.... to make room for the 3 keys on the right (instead of a 2.75u shift). wish this was out when i went to 60%, would have jumped all over it. i'm one that needs dedicated arrow keys. the "pure" was about the only option at the time...
if you are looking for arrows on the bottom right, look at either the KBTalking/Vortex Pure layout (only difference from standard is a 1.75 right shift, linked above... "this"), filco minila, or something with a little separation like the Leopold FC660M.