2. Tausig-Weber- Invitation to the dance
Alkan sonata op.33
btw why dont do complete symphony??
Godowsky etude no.5? (is that op.10 no3 from chopin LH alone??)
Re the Alkan Symphonie, I'd be very wary of the last movement (should you choose to try learning the whole piece). You're going to need both a well-developed lh octave technique and good passagework in both hands (there's some tricky bits where the lh echoes the rh passagework); and it's very easy to lose clarity under pressure and just end up making an almighty noise instead.
say, besides unusual music - hardly anyone plays music for right or left hand alone. here's unusual composer, auguste dupont, who composed fantasy and fugue op. 41 for RIGHT hand alone.