Yeah our customs are fools im thinking about just generate a seed then wipe the device
and generate a new seed and use a passphrase but im not sure if that enouph to be 100/100 safe
I don't think your customs officials are experts in opening trezor case without a trace and adding anything malicious inside

You can always wipe/reset your device and generate new seed phrase with additional passphrase for added security.
Another option is to generate seed words offline with iancoleman tool and them import those words in your trezor.