Have you played music for two pianos before?
Check out W F Bach.
Yes, nothing extensive (I focused mainly on solo/concerto rep for my undergrad). I've done some Bach transcriptions and a Brahms Hungarian dance (although the Brahms was for one piano four hands). I've also done the Schumann concerto and the Saint-Seans 4th on two pianos but those don't really count.
Will any transcription of works for two pianos be your consideration?
Four hands one piano is EXTREMELY different from two pianos. They are not at all the same thing. Playing concertos with 2nd piano accompaniment is also COMPLETELY different from playing real two-piano music, so you are correct when you say they don't really count. I haven't done any two piano works by W F Bach, but one of my pupils recently started one (I think it was that Sonata in F actually) so I will get to know it very soon.