Your request was to go an octave up from a guitars bottom 4 strings. That is only 2 semitones up for the standard D string on a baritone ukulele, 2 semitones up for the G, 3 semitones up for the B string and 3 semitones up for the E string.
You can easily take a standard baritone up one semitone. 3 would be pushing your luck.
Or as Jim stated, tune in 4ths but not so high.
Anthony