The guys at Wizardsardine and Liana Wallet have been working on a standard for encrypting wallet data (not keys, but descriptors, labels, state) so it can be stored in more easily accessible places.
Bitcoin encrypted backup* (BEB), enables users to outsource long‑term storage to untrusted media or cloud services without revealing which addresses, scripts, or number of cosigners are involved. Encryption keys are derived from the lexicographically‑sorted public keys inside the descriptor or policy, so any party who already holds one of those keys can later decrypt the backup without extra secrets or round‑trips.
This is really cool! You could have a multisig where any one of the keys can decrypt your encrypted backup of descriptors and other waller data, so that you only have to keep one piece of data super safe (your keys). Great work!