Sounds like you want to always have the user see a specific homepage when they log in, regardless of what they previously selected.
You could accomplish that by using a Business Rule on the User Preferences table to re-set their homepage preference when it is changed. The reason this would work has to do with how User Preferences are saved per-session. When you log in, your session essentially takes a snapshot of what your user preferences were when you logged in. If you programmatically change that user preference AFTER they are logged in, the change is not shown to the user until they log in again. With that in mind, what you want to do is use a business rule to set the value of their homepage user preference when they switch homepages.
It goes like this: log in > Homepage 1 > switch to some other homepage > Business Rule changes User Preference back to Homepage 1. This change is not visible to the user until their next log in.
The net result of this is that your user can sign in, change their homepage to something else, log out, and then the next time they log in, it's been reset to the homepage you specify.
Your business rule would look like the screenshot below.
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