Suresh
Some great suggestions here, and I have no experience with hearing aids or equalizers. I however can recommend silver cables for increasing treble; either high purity silver, or silver plated. For me personally (since my hearing is not yet fading), they can be a bit much in the detail department....but I could definitely see them as beneficial for needing more emphasis with treble.
Some cables I've tried (some of which I still own): LavriCables, DHLabs, and Zavfino. Those brands seem to offer a very cost effective entry point