Another solution you could try is to get an inexpensive acoustic guitar quick release strap (like the one linked below). Attach one end to your normal strap (instead of attaching to the upper horn) and loop the other end around the headstock, just above the nut. You are basically putting an extension on your normal strap and strapping on like an acoustic guitar. I found it works pretty well for neck dive problems.
D'Addario DGS15 Acoustic Quick Release System
D'Addario DGS15 Acoustic Quick Release System