...I'd expect low tension and quiet voice.
I agree and I'll also add that intonation is going to start at ~10 cents sharp at the 3rd fret and get even worse as you go up towards the bridge, specifically on account of the too-low tension and the fact that a saddle parallel to the nut will not allow for enough compensation to offset the required string length to achieve useful compensation.
Due to physics, it will be impossible to fix the compensation within the 3mm of a uke saddle's width, you'd need to bolt-on something like a Fender P-bass bridge with movable saddles so you have about 20mm of throw to adjust them enough to get usable compensation for intonation correction.
OTOH, if you go the other way and use strings that are fat enough to
not have too low tension, you are likely starting with something like an 0.032" nylon string for the E4 note, and the rest will have to be wound classical guitar strings, and just guessing gauges here for ~15" scale for a concert uke, something like
E4 - 0.032" nylon classical
B3 - 0.038" classical wound
G3 - 0.045" classical wound
D3 - 0.056" classical wound
and for all these strings you'd likely have to file all the nut slots wider, as well as the bridge slots for the D and G strings....and likely you will STILL have intonation issues even if you can achieve ~35 lbs total string tension.
all of this is the long-way-around of saying G6 DGBE linear baritone tuning on concert scale is a really bad idea.
YMMV