Alisonquilts here, on the forum has already made her own solar rings.

Watermom has had success cutting her solar cover into pieces. In her case to ease installation / removal but would reduce the chance for entanglement.

I do not believe that liquid solar covers would be much help - at best it might reduce some evaporation on a windless night at the cost of dumping mystery goo into your pool.

Please remember that pools are NOT safe. Admittedly, adding a solar cover may add to the risk but the primary mitigation must be protecting the perimeter - excluding all people or animals that could end up in the pool when they shouldn't. That said, mitigating the secondary risk doesn't hurt.