If you take a look at the PRD it states this about sunder, disarm, and trip maneuvers:

You can attempt [this maneuver] ... as part of an attack action in place of a melee attack. Source

Now, the magus Spellstrike feature states this:

Instead of the free melee touch attack normally allowed to deliver the spell, a magus can make one free melee attack with his weapon. Source

So my question, then, is this:
Can you deliver a Magus spell through a sunder, disarm, or trip maneuver by substituting it for the free melee attack?