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Hello Jenn DiMaria!
You are on the right track with the 2 options!
The SFDC option of using the Sync Profile is good one. There is no explicit guide as all the setup is done in SFDC and each customer has their permissions and hierarchy set up a little different.
In essence though think of the Marketo Sync User as a normal user. Whatever the Sync User can see, Marketo can see.
So if there are records that you want to hide from Marketo to prevent them from syncing, the way forward is to not give permissions to the Marketo Sync User in SFDC that will let them see those records.
I'm sure your SFDC admins have mastered the creation of users but SFDC has some documentation they can use as a refresher if needed: User Permissions
The important thing is to test what Marketo can see before you go ahead with enabling the sync. In order to do that, have your SFDC admins set up the Marketo Sync user in SFDC without the permissions to see the UK leads. Then you can use the Marketo Sync User credentials to log in to SFDC. If you indeed cannot see them, nor will Marketo and as a result they won't be part of the sync between the two systems.
I hope this helps!