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Please don’t do this, don’t use a 100 char long BIP passphrase. 24 words already provide an astronomical amount of entropy (astronomical is not even a word for it), there is zero reason to do what you are doing.
You want a passphrase because you are afraid that someone steals your offline seed? Great, add a small
passphrase that you can remember and call it a day.
If and when you are robbed and the seed is compromised you will need to transfer your coins anyway as soon as you can and any normal passphrase will give you enough time for that.
You are just asking for trouble with the 100 char passphrase.
If you are really paranoid go with multisig.