In the last 40 years, I have ghostwritten newspaper columns, press releases, TV-radio adverts for leading brands, social media content, audio-visual presentations, research papers, name it. I have also served as media bureau chief for a Philippine senator and lobbied lawmakers on various causes, including but not limited to tobacco taxes and freedom of commercial speech.
Your requirement seems right down my alley as I am adept in legalese and drafting gripping, crackling bills and position papers that make government consider - and reconsider - national policy.