I generated a paper wallet and encrypted the private key with BIP38.
How can I validate that I entered my password correctly?
In other words, I don’t want to send to this address if I mistakenly entered my password wrong.
I don’t know if this is the answer you’re looking for, but there used to be a site called tizop, which is gone from the internet, but is available on archive.org:
https://web.archive.org/web/20160309172914/http://tizop.com/peercoin.htm
The final tab on the webpage says “Wallet Details” - if you type in your private key, it should generate the public key, so you can compare it to what you’re expecting, to make sure the public/private keys match up.
Before you do the above, it’s best to download the webpage locally, perhaps to a USB stick.
The private key is encrypted though