Good heavens. Define "lesser known"! Lesser known than what? The French Suites? The Goldberg Variations? The WTC? Off hand there are probably several hundreds of keyboard pieces by Bach; perhaps thousands. I haven't counted. Granted that a substantial chunk of them are for organ, and require the resources of an organ (specifically the pedals, and frequently at least two manuals), but even so...
I would note, however, that none of it was written for piano; there weren't any. Some of it is quite playable on a piano; some of it isn't -- but in any case, one must, please, adapt one's style to the music.