I think I've isolated what I find so perversely appealing about Stella Monye's singing: it's the overwrought articulation!
Anyway I was trying to keep up the theme of synthy 80s stuff*, but this song is actually off the album Change of Hearts,
from 1990. Close enough.
Stella Monye - "Sallie Girl"
*Yes, Vinz... I was in the process of putting up the Wil Onyeabor last night, but I got a bit distracted. I'll get to it soon!