The string posts on Gotoh FB30LP has a larger diameter than the GB1 set, so they won't fit. I suspect that the base plate will be too big also.
Hipshot's GB1 equivalent set, the hb10 can be supplied with lollipop keys:
https://hipshotproducts.com/collections/bass-tuning/products/hb10-bass-tuning-machine?variant=43376337224