Many, many, decades ago I simply put a hole on the center of a tambourine and used an addition hi-hat clutch to fit it above the hats on the same rod. It was of interest that many years later I saw just that idea as an accessory somewhere....
It was generally heard as I played the hats with foot on 2 and 4 rather than be hit with sticks. Bit like a tambourine player might accent the 2 and 4.