Random sample guaranteed to hit each employee w/ item cap?

Hello.

I'd like to run a random sample search which will return a minimum of 1 message per employee while also permitting a configurable item cap. From the documentation, neither a guaranteed sample nor a statistical sample meet my requirements.

- Guaranteed sample will return a minimum of 1 message per employee, but has no cap

- Statistical sample has a configurable cap, but will not necessarily return a minimum of 1 message per employee

Anyone know of a tricky workaround?

Thanks ahead of time!