New karcher with old karcher accessories?

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Hi all,
I bought a new karcher k4 to replace my recently broken 30 year old karcher 310. I hadn't realised that they have changed the connector slightly and my old attachments won't work.

I have seen there is a connector available to use new accessories on old systems (connector M) but not the other way round. Does anyone know of anything I could use?
Thanks,
Ads.

[x type]

https://www.karchercenterjhs.co.uk/karcher-adapter...

any good ?

[900sAds]

Unfortunately that's to allow newer products to work on older systems. I need the other way round.

I guess I could buy a converter for my house to be push fit and alternate the hoses.. But it seems crazy to have to do it that way. May be easier to buy new accessories.