Maybe I can help a little bit:
Getuigen de Heer William Ferdinand van Reede van Oudshoorn (Baron van Rede, Lord van Oudshoorn);
Juffrouw Gesina Kirsten (maybe his wife, because he was married since 1777 with Gesina Kirsten, daughter of a Sachse-Weimar soldier Johann Friedrich Kirsten),
een Louisa Johanna van Schuler...dum (the rest I cannot read)
wylen der Heer Cornelis van Aerssen Beyeren (an old noble family from the southern netherlands)
Cornelis van Aerssen Beyeren was the husband of Louisa Johanna van Schuler