How badly do you need 4 rings? I have my testing hammock set with webbing through rings on one end, a structural ridgeline and just rope/webbing on the other end. I'm using the ring end for the final tensioning step, mostly.
How are you attaching the webbing on the other end? Most method I've seen are slower than the buckles, even though you really only need fine adjustment on one end.
"Physics is the only true science. All else is stamp collecting." - J. J. Thompson