Can two different PSN profiles be accessed by a single ps3 user?

I have a UK PlayStation Store account, I live in Ireland. However, just found out my Mass Effect Trilogy boxset is US region, so the UK DLC isn't compatible. Rage! I am wondering is it possible to set up a fake US account to download the DLC, or is the fact that my profile is linked to a UK account make this impossible? Should I make another profile on my PS3 system specifically to play the Mass Effect games and link THAT profile to the US account? Any help would be really appreciated.

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Can you have more than one PSN account on PS3?

Only one account can be associated with each User of the PS3\u2122 system.

Can you have 2 PSN accounts on one console?

You must use a different email for each PSN account as you are unable to create multiple PlayStation Network IDs under one email using the same console.

How do you switch users on a PS3?

Go to Settings > Users and Accounts > Account > Profile > Online ID.

Create your new online ID.

Follow the on-screen instructions to complete the change.

After you complete the change process, you're signed out of all devices.

How do I create a new PSN account on my PS3 if I already have one?

Press and hold the PS button to reveal the quick menu.

Select Power > Switch User > New User > Create a User.

Follow the on-screen prompts to create the account for PlayStation Network.

Enter the necessary information.

Verify your email address. Check your email for a verification message.

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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Karolina Grabowska, Felicity Tai, Felicity Tai, Liam Moore