HI Andy,
Don't know if this is any help mate, but this is my barber hauler setup.
This gets used for the staysail on the inner forestay , as well as the headsail on the forestay, and the gennaker on the sprit, and seems to work really well.
The red sheet is the headsail, the black sheet was the gennaker sheet. Surprisingly to me, when the headsail is furled, they don't bother removing the sheets from the rings, and the gennaker sheets don't seem to get fouled or rub, which I didn't expect.