SLIP39 seed phrase . With a hidden wallet question

If you set up your trezor 3 or 5 successfully on slip 39 and add a hidden wallet ( passhrase ) . Later in years to come, you find yourself upgrading to Multi share backups.
HOW will multi share backups allow you to get access to first hidden( passphrase) wallet you created at first. Should I set up first and foremost, the multi share backups and then add the passphrase?
In other words, is it wise to park your crypto on the standard wallet using slip 39 format. Later set up multi share, backups, and later at the add passphrase.

The passphrase is not part of the backup.

Or, to put it differently, the thing you are backing up is (a) the standard wallet plus (b) all of the possible wallets for all of the possible passphrases.

Or, in yet other words, when you restore your Trezor from backup (any version of your backup) and then try to open a passphrase wallet, it will just work. As long as you remembered the passphrase right, that is.

Or, another way to put this: When you ““create”” a passphrase wallet, nothing new is in fact created. You are just opening a wallet that was, in a mathematical sense, “already there”. All the passphrases are an intrinsic part of your wallet, regardless if you ever used them or “created” them or if you never touch them.

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