[Cryptography-dev] How to copy attributes & extensions from CSR to CSRB?

I am working on a Let's Encrypt client that needs to create a new CSR, signed with a new key, every time that it renews a certificate. AFAICT, there really isn't any sort of "CSR template" format that I could put in a configuration file, so my preferred approach would be to simply use an existing

Re: [Cryptography-dev] How to copy attributes & extensions from CSR to CSRB?

This is the (as you noted, unofficial) escape hatch we added for alternate ASN.1 types that aren't UTF8String. We may revisit this once the ASN.1 DER work (https://github.com/pyca/cryptography/issues/12283) lands because then we'll have a public API for generating arbitrary ASN.1 structures, which