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What tends to happen is that the tallest upstairs radiator has to be bled two or three times during the first couple of months after draining & refilling, and then no more air collects. Once that process has finished, the boiler pressure is steady - i.e. the system doesn't need re-pressurising, I wondered if oxygen entering via the plastic pipes is being removed by the inhibitor, thus gradually lowering the concentration of the inhibitor.If it was drawing in oxygen through the pipes i'd expect you to be constantly getting air in the system at the highest point. From my experience of none barrier systems this is what usually happens, or the Auto Airvent lets air out and the system is having to be repressurised regularly.
Your easiest way would be take a valve off and take an insert out to see if there's a barrier.
I will bear in mind what you said about taking a valve off,