If your only problem is the collection of those informations, you could simply set up a webserver. Apache, for example, stores all of that without further configuration.

If quantum computers appear, all public key cryptography based on integer factorization and the DLP will be broken completely, whereas quantum attacks against symmetric ciphers require at least 2^(n/2) steps (this is what your Futureproofing point is about)

OTP is a symmetric (theoretical, because the key is too big) algorithm for encryption. It's not related to public key cryptography. Also, your post seems to be regarding symmetric key cryptography mostly, not public key cryptography.

This should probably be on crypto.stackexchange.com