You may want to reach out to Dr. Sile O’Modhrain (https://smtd.umich.edu/faculty-profiles/sile-omodhrain/).

She is a highly experienced blind researcher & a co-founder of NewHaptics, a tactile display startup (https://www.newhaptics.com/).

Even if you want to focus on accessibility testing rather than hardware, Dr. O'Modhrain may be able to connect you with useful guidance. I would also mention your programming experience in case NewHaptics is looking for someone to help with testing hardware, firmware, or drivers.