I just need a user-friendly way to sweep bitcoins from a offline paper wallet onto the Blockchain, without having to expose your private key, whilst you are online. ....
The bitcoins in the paper wallet are already on the blockchain. What you are asking is about moving the private key from a paper wallet to some kind of wallet that can be used for transactions.
You can create a transaction off line. Hence it is possible to never expose a private key to an online wallet.
https://bitcointalk.org/index.php?topic=944915.0