But generally even save and get privacy

I made a typo in the link. Here is the correct one..

RPC Interface | Wasabi Docs

A step by step guide on how to use the Wasabi remote procedure call interface. This is the Wasabi documentation, an archive of knowledge about the ...

If terminal UI is enough, then here you go!

Funny how you had the exact same idea, this has bothered me since forever, now I'm happy.

The regular flow is receive money, coinjoin, make payment, coinjoin the change. The new flow is receive money, make payment in the coinjoin, that's it, your leftover wallet is already private. MUCH cheaper actually.