Pardon my late reply, but I wanted to wish you well in your endeavor. I agree with Ray about the walnut. My first harp ever was a Dusty FH26 in walnut, and what a sound, even for a smaller harp! It was-IS- wonderful, though I don't own it anymore. as it lives with one of my students. I get to see it and play it every week, which is bittersweet.
Regarding the hearing impairment, I'm a harp therapist, and when I need to play a portable harp, I play a Westover therapy harp, which, while wonderful for what it is, has nowhere near the vibration of my old Dusty. However, I had one elderly woman who was profoundly deaf who used to wheel herself over to the harp in her wheelchair and place her hands on the soundboard. She could still speak some, and would say "I can't hear it, but I can feel it and it's beautiful!" Every week when she saw the harp arrive, she would encourage others to listen and touch the harp.
Best of luck to you, and revel in your harp journey.