I did almost exactly the same thing a few years ago. Used the same glavanized tie wire and twisted it oto the same spot. The pull only works when the trunk key is horizontal, when the vacuum lock also works. If you figure out how to have a pull with the key veritical, when vacuum locks do not work to unlock the trunk, LMK. I always leave my trunk lock in the vertical position for more security. It's too easy for thieves to smash your window, pull up on the door knob and have access to the trunk.

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked