Cheers for the kind words everyone.
I am not a fan at all of these moustache bars (sorry @bright). The idea of non-drop bars was to get more control and confidence in handling and benefit from the better brake modulation. The current setup is definitely too short and upright. It makes handling worse and less confident.
My view is the upright shorter posture is the intended characteristic of swept bars like this and attempting to bring the reach back out to what you were used to with drops/hoods is seriously uncomfortable because of the moderate amount of sweep.
I believe there is a sweet spot to be found. After all, I am riding swept-back bars on my MTB and I love it. So much control and so comfortable. The bars on the MTB are much wider though.
So I did some googling, math and photoshopping.
On my MTB the distance from the saddle tip to the centre of the handlebars is approx 57cm.
With 80cm wide bars that makes for a distance of 65.5cm from saddle tip to handlebar end.
With the current setup on the Raleigh, I only have 52.5cm from the saddle tip to the centre of the handlebars and due to the generous back sweep of these bars, it's only 50cm from saddle tip to handlebar end.
I have some older Trekking bars lying around. Ergotec Moonbars. They are a few cm wider and have a little bit less back sweep. These bars are easily available in silver 25.4mm for about £13. They would already increase the reach by a few cm. Paired with a longer stem they might do the trick. I would need a 120 or 130mm stem though and visually I think 100mm looks just right.
Looking for alternatives I found the SimWorks get around bars. They are definitely more expensive but doing the math it seems like combined with my current 100mm stem would give me a very similar reach to the MTB. Saddle tip to centre approx 55.5cm and saddle tip to bar end 65.6cm.
I did a quick mockup and that seems alright with me!