Is there a platform that can generate a BTC wallet that requires 2 passwords - similar like multisig. So to get into the wallet and send BTC from there, you would have to enter 2 different passwords dependent on each other.
You can use some implementation of
Shamirs Secret Sharing. Unfortunately, I don't believe any wallet software implements this. I would also point out that if you were to implement this, once you decrypt your wallet, the private key would be available in RAM (as would be the case if your wallet was encrypted by a single passphrase.
The passwords have to be changable independently of each other. So everyone with a password can handle it for itself.
it is important to point out that when you encrypt something, you do not have a password, you have a passphrase. This is true even if your passphrase is a single word such as "
November". It is also not possible to change a passphrase. If someone has a copy of your encrypted file, if they learn your passphrase, they will be able to decrypt it. What you can do is decrypt your file, and create a new file with a new encryption key/passphrase. If you do this, you will need to destroy any old copies of the file in which you used your old passphrase, as this old file can be decrypted using your old passphrase.