Effortless Trickery outside of combat?

[Cao Phen]

Looking to see how is this like, I was wondering if you can actually use Effortless Trickery outside of combat, since it uses a swift action.

Effortless Trickery:

You can maintain concentration on one spell of the illusion school as a swift action. This has no effect on spells of other schools or on illusion spells with durations that don’t depend on your active concentration. While you may only maintain one spell as a swift action, you may take your move and standard actions to maintain other spells normally, if you wish.

Seeing that you can take the time to use a wand as a standard action outside of combat before entering combat, would it be allowed to have a gnome, which is the race required to get this feat, to constantly use swift actions in order to keep, lets say Silent Image of a Gnomish buddy, with them at all times, except when sleeping?

Rules on Swift Action here:

Swift Action:

A swift action consumes a very small amount of time, but represents a larger expenditure of effort than a free action. You can perform one swift action per turn without affecting your ability to perform other actions. In that regard, a swift action is like a free action. You can, however, perform only one single swift action per turn, regardless of what other actions you take. You can take a swift action anytime you would normally be allowed to take a free action. Swift actions usually involve spellcasting, activating a feat, or the activation of magic items.

[Robert A Matthews]

I don't see why not, provided nothing breaks your concentration:

Magic wrote:

Concentration

The spell lasts as long as you concentrate on it. Concentrating to maintain a spell is a standard action that does not provoke attacks of opportunity. Anything that could break your concentration when casting a spell can also break your concentration while you're maintaining one, causing the spell to end. See concentration.

[Malag]

You could essentially maintain the illusion as long as spell lasts outside of combat.