Just when you think you’re out, they pull you back in. All kidding aside, it sounds like you should take a look at the Finesse (now Thermo) TruFlow. It is a compact manifold solution designed specifically to address the challenges associated with bioprocess gas management. Per your requirements, it manages up to 6 gases and can direct gases to headspace or sparge. Bonus fact, it was known as the “Zola” during it development. I cannot speak to whether the system is available individually or must be part of a Thermo solution. The link below will provide you with more information.