Agreed. A small 50mm f/1.4 or 1.5 ASPH. Close focus 0.7m. Decent bokeh at the expense of wide-open sharpness if necessary. No focus shift.
I will take the same size as other fast 50mm lenses and agree with the rest of your wish list. I want to give them room so they don't have to sacrifice quality and can still deliver a lens at their expected price point.