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Situation occurred in a game yesterday versus Tyranids. My opponent charged and challenged my Wraith Squad with a Destroyer Lord equipped with Mindshackle Scarabs. The Hive Tyrant failed his leadership and scored 1 attack against himself. The question came up, could I force the Tyrant to perform a smash attack against himself, in this situation?

No. You resolve d3 attacks against the tyrant. "using the Victims Strength and weapons'' (although you can choose the weapons he uses if their is an option)

Pg 81 Necron Codex wrote:
The hits are resolved at the victim's Strength, and benefit from any abilities and penalties from his close combat weapons (the controller of the mindshackle scarabs chooses which, if there is a choice).

While the Smash special rule is tied to the model, you may only choose to use it if its on the weapon profile. Since its on the model, you would not get to use Smash Attacks, but do note that because the model still has Smash, its attacks are made at AP2 (unless it has an AP1 weapon) across the board. :3