Retrofit Sennheiser IMMERSIVE sound system CUPRA Leon MK4?

[Goot]

I've been looking at some 1yr old facelift CUPRA Leon MK4 VZ2, but none of them have the optional Sennheiser IMMERSIVE sound system installed from factory.
As SEAT Sound is available as retrofit option for the previous generation, is the Sennheiser system likely to become to retrofitters any time soon?
Any idea how much it would cost to supply and fit once it does? Currently £600 on a factory order so no idea what how the pricing works for retrofitters vs factory order.
Whilst I'd prefer a factory order car, I've seen some tempting prices for used cars but the lack of sound system upgrade is doubting whether I'd be happy long term.

What was the lead time for retrofitters to get hold of SEAT Sound after the last car generation was released, months or years?

Considering my options before I make a decision on new vs used.

 

[East Yorkshire Retrofits]

We've fitted Beats to the prefacelift Mk4 and whilst it's possible, there's tonnes of parts and labour involved. It was one of our previous cars and the parts alone cost us £1600.