@eva2000, wow, you’ve been pretty busy!
For anyone reading this thread, that looks like a great set of resources if you want to try setting up a separate VPS (virtual private server) in order to use it to get a certificate which you then copy into a separate environment. This is clearly more work on the user’s end than getting Let’s Encrypt’s technology integrated with their existing software or hosting environment so that the certificates can be obtained from within the existing environment, but it could be especially useful to people who have been approved for the beta and feel that they need certificates right away or want to confirm that the certificates will eventually work in their application or environment.
One thing to keep in mind from a security perspective is that the VPS provider will, at least temporarily, have access to your private TLS keys and could copy them or could leak them if the provider were hacked. There’s no specific reason to expect any security problems with this kind of solution; you should just be aware that you’re trusting an additional company and an additional set of software with your cryptographic secrets.