So I had some time to use nginx as reverse proxy and it seems to work.
So I used for testing a tls v1.2 page with sni and new ciphers:

https://fancyssl.hboeck.de/

supported ciphers from server:
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030) ECDH secp521r1 (eq. 15360 bits RSA) FS 256
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x9f) DH 2048 bits FS

Success Microb was able to show me the page

So in microb I put http://fancyssl.hboeck.de and could see the page.
When I was using https I got a ssl_error_no_cypher_overlap. It could be that nginx using the cipher from microb which is not allowed with fancyssl.

So it was easier as I thought I used in the end this information here:

https://superuser.com/questions/1487...era-wi/1487784

So all connection from microb to nginx are http request which get translated to https. You only need to set the proxy in the connection settings to 127.0.0.1.