Command undead

[Drimoran]

Some days ago I asked that if a Holy Vindicator with the bloodrain and bloodfire class features would deal an extra 2d6 while using channel smite. The answer was that channel smite was not channeling energy but using one use of channel energy, so the extra 1d6 from bloodrain would not apply.

This made me have a different question:

If I have such a feature like Undead Servitude:

Undead Servitude:

You gain Command Undead as a bonus feat. You can channel negative energy a number of times per day equal to 3 + your Charisma modifier, but only to use Command Undead. You can take other feats to add to this ability, such as Improved Channel, but not feats that alter this ability, such as Alignment Channel

Then I can channel negative energy but only for command undead.

As Channel smite is not "channeling" could I expend one use of this channel negative energy (from Undead Servitude)uses to Channel smite?

Channel Smite:

Before you make a melee attack roll, you can choose to spend one use of your channel energy ability as a swift action. If you channel positive energy and you hit an undead creature, that creature takes an amount of additional damage equal to the damage dealt by your channel positive energy ability. If you channel negative energy and you hit a living creature, that creature takes an amount of additional damage equal to the damage dealt by your channel negative energy ability. Your target can make a Will save, as normal, to halve this additional damage. If your attack misses, the channel energy ability is still expended with no effect.

[Imbicatus]

No. you cannot channel smite with the channel granted by Undead Servitude mystery or the Power over Undead school ability for anything other than Command Undead. You cannot use those channel uses to use Channel Smite, and unless you have a non-restricted channel energy class feature from another class, you cannot take Channel Smite because it alters channel energy. Even if you could, it would deal no damage, as you are incapable of using those channel dice to do damage.