RH drive car, looking for remote oil filter options

Since the factory adapter is already in place, and it doesn't leak; you're already miles ahead of where any aftermarket kit will leave you.
As Dana said, find an appropriate place to relocate the filter to, and bend new hardlines or use braided stainless to plumb it into the new location- if the filter is frame mounted instead of engine mounted (as it currently is) it will have to use flex lines instead of factory-type hard lines to compensate for engine movement and vibration.