Gustakh dil : straight rock and roll, sounds a lot like the old Chubby Checker type songs.
Banda yeh bindaas: my guess would be reggae/calypso
Aao twist karen: rock'n roll, also Mera naam chin chin choo and Eena meena deeka.
Do lafzon ki hai tries to emulate more traditional Southern European sounds, but I am not going to put a name to them and establish my ignorance!
I would steer Sumitra away from the Cabaret/item numbers and towards more melodious songs. Just for our sake!
RD Burman's 'Pukaar' had baila-based songs that I love:
Jaan-e-jigar duniya mein to sabse hasin hai
Bachke rehna re baba.
Good guitar here, Sonia!
Salaame is a good song: Priyani... she has not sung this type of song before, has she?
It's a large world and we have very 'inspired' composers, so lots of choice!