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Most reports have the option to filter the metrics by a smart list. E.g. you can define Email Address not contains "yourcompany.com" to filter out the metrics only for the non-employee metrics. You'll still have them as campaign members though.
We have a smart list that is called "company name employees" and we use it similar to our "competitor" smart list. It makes it easy to add in Not a member of " " smart list into our flow steps.
We also disqualify our employee email addresses which makes it hard to get them into the campaign. If they want to receive the email still, unfortunately it will skew your number.
You can also use a separate campaign for testing.