Diki, I feel your baritone pain.
I am constantly transposing original keys down a minor third, at least, or with Queen songs, a sixth. Obviously, things need revoicing at those extremes. Even doing an eight-week singing course (reasonably dedicated) did not really help me increase my range much. Maybe, added some strength in the upper reaches.
But ultimately, it's the performance that carries the audience, so I am sure they are not fussed what key it's in, as long as it sounds good.