Look no disrespect to those high end ( and expensive) mounts you mentioned, but the Celestron CGX covers your requirements at a more reasonable price with local sourcing and support.
https://www.bintel.com.au/product/ce...v=322b26af01d5
I have had mine for four years and it has performed without drama, and can easily image with 25kg and more. Belt drives, spring loaded worms, completely internal cabled, mechanical hard stops and soft limit and programmable home settings (It can image across the Meridian by up to 20 degrees). Good software pc control with the Planewave developed app. Advertised image limit of 25kg (which is really the stock tripod mounted limit) but realistically the head unit can handle more and has when pier mounted. You can also upgrade to the CGX-L tripod, or buy a CGX-L and get 34kg of image capacity on its stock tripod.
Worth looking at imho.