Hi, sounds like a mission
a few ideas ..
Could you ask your Early years dept if they have any loan services for cultural items.
Do you keep a note of the book titles that support multi cultural awareness and those that depict positive images of disability.
Do you plan activities for cultural festivals throughout the year where photos could be added to an album for inspection purposes. And maybe the same for disability awareness campaigns - Disabilityawarenessday.org.uk
In planning interest based activities with the children are you able to add, swap out, extend or change what's needed - images & resources so that disability & culture can be included more regularly - brown paper for faces, hand outlines/prints. Skin toned paints as a change to primaries or pastels. Different vehicles/transport and homes with small world play areas - inuit, mexican, african, chinese, italian, indian. Vary foods where origin can be discussed.
Do you have or can you setup links with parents, local organisations to request donations/loans that support awareness of disability & culture.
Music, food, dress, homes, native animals, vehicles, relationships, ethnicity & nationality, languages, country names, aids for disability and types of disability could be one way maybe to evidence how children access this information.
Hth, let us know how it goes xx