What I would focus on is the Jambs, Tympanums, and various other forms of art that serve as narratives of stories of the Bible that allowed illiterate peoples to understand Biblical teachings. I would like to focus on Chartres Cathedral because I believe there is much didactic learning in the architecture and design of the church.
I am not sure who to contact at the ICA but I would perhaps want to look into the ICA's design plans and architecture and attempt to find pieces that are didactic as well as email some personnel about the effects they hope they will have on the public and audiences they will have.