Lightweight uprights?

So I looked at most offerings for bikes that have true "upright" positions, and they weigh around 20kg. The lightest on the market was around 15kg. Pashley's Sovereign was around 23kg.

I eventually bought a 3 speed chromoly hybrid, put an enormously fuck-off long quill stem on it, then lightened it up with a carbon front rim and carbon seatpost. I am trying to make it 'as light as possible' without violating its overall capability of grabbing groceries without popping spokes, getting flats, or otherwise fucking up the 'comfort' aspect.

I got it down to around 11kg (sans rack) but obviously the tendency is to start obsessing over weight figures.

Its current configuration is pictured, with a tubular alloy rack.

Tips? I'm thinking that the knockoff Deep-V rim has to go, maybe swapping the chain and rear cog for something better/lighter? Lighter crank and bottom bracket? I'm worried I'll fuck up the chainline, though.