This has been my own solution.
HH & WBBB: Gathered End to Larkshead knot to climbing grade ring to whoopie sling suspension. Ring is sheltered by the tarp, and in event of rain, I slide the grey hairband to the middle of the ring and position it to hang down. Water goes down the ring to the band but not back up the other side. Has yet to fail.
Note ignore the plastic carbiner in the foreground clipped to the ring and obscuring the hammock larkshead. It supports my undequilt shockcords. In bad weather, I clip it just above the hammock.