Ukers who want to play bass, but do not want to play a long scale, can simply play a short scale bass.
actually, short scale basses rarely go under a 30" scale, and when they do it, they are called "micro" basses, like the Ibanez Mikro bass.
there is a lot of confusion over scale lenghts and names, because, for example, Fender produces since the 60's a bass called Fender Bass VI, which is a 30" bass guitar with 6 string, strung EADGbe an octave lower than a guitar.
so it has the range of the bass, the scale of the bass, the gauge (on the lower strings) of a bass, but 6 strings with the guitar intervals.
Robert Smith of The Cure uses the Bass VI as a "guitar", for melodic lines since the 80's, when he left his Jazzmaster for the Bass VI, but Simon Gallup used it in the same band as a bass guitar.
George Harrison and John Lennon used it as a bass in many tracks from the White Album and Abbey Road, and so did a lot of country players since the 60's.
however, when a bass player sees the Bass VI not knowing it, it calls it a guitar, and says it's not a bass... but it's in the same octave of a bass, shares the scale and the gauge with the bass...
what is it that doesn't make it a bass?
it's simply in the design: it looks like a guitar, with a narrow string spacing, small tuners on the headstock and a smaller size compared to a 34" Fender bass.
how many people think that the ukulele it's just a small guitar with 4 strings? you just pick the first 4 strings of the guitar, like if there's a capo at the 5th fret, and there you go. right? with a linear tuning there's no doubt about it
the Ukulele Bass is just a Bass with the size and look of an ukulele. the steel strings Ohana are a bit different, larger, but still less than half an acoustic bass...