Started with our local uke group last summer and as a bass player coming out of retirement as a semi-professinal. Someone gave me a small electric guitar retrofitted with bass tuners and bass strings. A small bass to play with the uke group, or so I thought. Problem being the tuning was terrible beyond the first fret. Sure the open strings would be in tune, and the first fret was bareable, but moving up the neck the problem gets worse and worse.
Thinking about it I realized the acoustical physics would explain why you can't replace a thin (guitar) gauge string with a thicker (bass) gauge string and expect the pitch to be identical at with identical lengths of string (spacing of the fret bars). Later I bought a fretless uBass.
Haven't compared them but I'm pretty sure the frets on the uBass are spaced a little farther apart than a baritone ukulele. It would be the same problem as my little electric guitar with bass strings. Also the tuning pegs are bigger / sturdier on the uBass compared to a baritone uke.