I came across those Wepoto hand grip and L bracket options for Ricoh GR III/GR IIIx cameras on DC.watch (available at Amazon US and Amazon Japan):
Padauk Wepoto grip/bracket for Ricoh GR III/x: Amazon US | Amazon Japan:
Ebony Wepoto grip/bracket for Ricoh GR III/x: Amazon US | Amazon Japan:
Golden Wood Wepoto grip/bracket for Ricoh GR III/x: Amazon US | Amazon Japan
