@o_e_l_e_o Thanks a lot for your suggestions.

    It's not even better to use tails without persistence? In this way you can create the wallet, note down the seeds and export the public keys for a watch wallet. After that, the wallet files and private keys will be destroyed, that means you can't loose them. After 10 or 20 years when you want to spend from this wallet you just need the seeds to recover the wallet and to regenerate the private keys. In all of this time you just need to have on a safe place the seeds, you can't be hacked if your private keys doesn't exist anywhere. Of course, for an improved security measure you can use seeds extension to add more words and store them in a separate location, it'll work like a passphrase for the initial seeds.
    What can go wrong with this setup, assuming that you'll not loose the seeds?