Overid a Dynamic Collection URL with a hook

So I’m not very good at programming and I’m looking for help with an afterrouter hook.
I have a dynamic collection for “meet the team”, but i’d like to override the dynamic url for specific users.
I thought the best way would be to add a field with a secondary url to the collection, and test if its null. if its null, next(), if it’s not null, route to the new URL. But I’m just not a programmer and am finding the velo help files challenging.
Anybody point me in the right direction?