It's a bit hard to see from your photo but I'll look up more examples! The AL19 is narrower and shorter still from the AL40 so let's see if it works out well for it.View attachment 538109 you may also be interested in slinging it like a sidemount bottle. put a loop of bungee under your armpit on the backplate that can be looped over the valve to pull it up tight. lower attachment just goes high on a waist d ring. with valve knob pointing out. this allows for amazing streamliming. picture is with al40, but a 19would be similar principles
Does that position impede reading the backgas spg? (although i also have AI so not a big problem)