GrenX are developing a RHD footrest hump delete. Please visit their link here, for specific details. All I can say is that it should resolve an issue that affects some RHD drivers.
The GrenX website, mentions that the product is coming soon, suggest us RHD Grenadier owners keep an eye out on this link for more information.
The images below are from my vehicle, taken in 2023 post delivery:
