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Thanks for your contribution.

You are working on two separate things here. Please create a separate issue for the kxinfo method. Before you start on a patch, let's first discuss if the feature should be added at all and how a good API should look like.

The same is true for set_ecdh_curve(). New or improved featured must be added to PEP 543 and implemented in a way, that works with other TLS implementations. I suggest that the function accepts 1..n group names from an enum of groups based on https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-8 .

I need to discuss this with @Lukasa first.