So I decided to crack on and do the upgrade, which was very simple. The 4/4 has a standard loom, so a matter of plug and play, and the hand built nature makes it very easy to upgrade the stereo.
I picked up a new Pioneer 580 DAB unit, with no CD, wireless bluetooth and hands free call capability (retails around the £150 mark presently). The speaker chosen were a direct fit Focal Access 100 (10cm), a little deeper than the original Clarion but much better and a steal at under £100. Surprisingly the Alpine unit was of good quality, just not up to spec with recent tech, the Pioneer was a 2017 launch so period to some extent but with modern functionality. The windscreen makes a perfect earth for the powered DAB aerial, and it is very discreet when fitted.
Speaker wire is not great, so I may replace that later, and clearance was slightly tight on the right but doable.
I also noticed that the OBD port wouldn't hold secure under the dash as the plastic sheet they use was too thick so a gentle amendment and it clicks securely in place. The wiring and work on this 4/4 is very neat, I secured a couple of wires with a cable tie that looked like they could benefit, aside from that a tidy and very clean behind dash space.
The cage was replaced easily with the Pioneer being slightly different, the old one removed simply. I ran a DAB windscreen powered aerial to the left windscreen, the blue LED will be blanked. This is discreet under the dash, and surprisingly effective for £10! The mic for the hands free calls was run to the right of the steering wheel and a spare foam boom cover added off my Sena kit for roof down calls (not that I intend to make many but it's handy to have).
The sounds was pretty dramatically better. The core issue is deadening, but I'll leave that as I don't want to add the lead panels I normally use on my cars as I want to keep the body stock.
Overall for less than £300 a very good upgrade and I'm very happy with it. The only addition I would consider would be a footwell sub tucked up, but I think for what the car is, less is more here.
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