One ship proposed for the route, was apparently the former Dover-Calais ferry MS Nord Pas de Calais which was built in 1987.
When SeaFrance was liquidated in 2011, Eurotunnel bought it and leased it to MyFerryLink until 2015.
After that it was laid-up and designated for use “for hazardous freight and waste”, before being renamed Al Andalus Express and sent to the Mediterranean. In March 2018 (when the Ostend Ramsgate route was originally planned) it was chartered for two months by Naviera Armas for Las Palmas and Puerto del Rosario.
At that point, Maritime News said “( It) is still one of the prospective ships for the proposed new connection between the Belgian port of Ostend and Ramsgate, in the United Kingdom. But this initiative, carried by Seaborne Freight, a structure created by former executives of MyFerryLink, has fallen behind.”
I haven’t yet Googled the MyFerryLink connection.