Looking for 2 in 1 laptop?

I'm looking for a 2 in 1 notebook; it should:

- have a thunderbolt 3 connection

-have a powerful processor (wants to play with an external graphics card)

- The main memory should be exchangeable / expandable

- the screen should be foldable overall good to very good.

- in addition, the speakers should not be a complete disaster

Price up to 1k

I had chosen the thinkpad l13 yoga, but the screen is not really good, but the KO criterion was the lack of a Thunderbolt 3 connection.

What you imagine will probably remain a wet dream (for now). 2in1 convertibles are always built relatively thin, so the RAM is almost always soldered, for a powerful CPU you need a reasonably good cooling system, which is not easy with a thin case. And then the whole thing for max. 1000 euro? The "cheapest" that I have found after a long search now costs a good 1600 euro https://www.notebooksbilliger.de/...pen+649891

As I said the one I mentioned satisfies all my needs, but has no Thunderbolt, for 1.4 k there would be the Thinkpad X360 that has TB

A two in one is usually not good. They are small, but they don't really fit good technology. I would rather look from 14 inches what there's