Underhanded + Force Athame

[Nicos]

Does the underhanded rogue talent be combined with the froce athame from th spellblade agus archetype?

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Underhanded (Ex)
Benefit: A rogue with this talent gains a +4 circumstance bonus on all Sleight of Hand checks made to conceal a weapon. Furthermore, if she makes a sneak attack during the surprise round using a concealed weapon that her opponent didn’t know about, she does not have to roll sneak attack damage, and the sneak attack deals maximum damage. A rogue can only use the underhanded talent a number of times per day equal to her Charisma modifier (minimum 0).

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Force Athame (Sp)

At 2nd level, a spellblade magus can sacrifice a prepared magus spell of 1st level or higher as a swift action to create a dagger of force in his off hand. The athame lasts for 1 minute or until dismissed, has an enhancement bonus on attack and damage rolls equal to the level of the spell sacrificed (maximum +5), and is considered a weapon the spellblade is holding for purposes of his arcane pool feature (using the pool to add abilities to a held weapon applies to the magus’s physical weapon and to the athame for no additional cost). The athame acts as a dagger, but the hand holding it is still considered free for the purpose of casting spells and delivering touch attacks.

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[partyrico]

Sure, I don't see any problem with it, as long as you can qualify the athame as a "concealed weapon"; that sounds like a DM call though.

[TGMaxMaxer]

Should qualify if you do it all in the surprise round, swift to create the weapon, standard to attack, for max sneak attack damage.

Its a weapon, that wasn't known about (since it didn't exist) until the surprise round.