At the FOSS Backstage conference I have met representatives of the Accessibility Lab (a11y Lab) and they mentioned to me that OpenRefine could be eligible for a free accessibility audit as part of their collaboration with the Open Tech Fund.
Although we are already aware of various accessibility issues in OpenRefine, I think it would be nice to have a better overview and hear from those issues from a different angle, so I would be keen to take up the offer.
@Martin is getting in touch with them and could submit an application.