Not add any friends to recover your private key, similar to current decentralized wallets. You must securely store your private key, as no one can help you recover it if lost.
Use account recovery (ERC-4337) by selecting trusted contacts during account creation, who participate in the recovery process
Your idea will be more convincing to us if you are talking about a deposit to a multi-signature wallet address. You choose the trusted parties so that you have the option that these parties be:
- 2-of-3
- 3-of-5
- 3-of-7
- 5-of-7
- 4-of-9
- 5-of-9
More or less thus giving a dynamic to the user, the only problem is ensuring how securely those private keys will be generated without a third party sharing them.
As for the idea of smart contracts and with all the bad reputation of bridges, I advise you to stay away from them, although I do not see how the privacy of users will be enhanced through them.