One more thing to think about is code. I am sure your PB will make it apply... in Vegas the total step can't be more than 11 inches... so assuming 1.5 in of coping, 3 inches of tile above water line, leaves a max depth of water at 6.5 inches, I can raise it to 7.5 inches by keeping the pool a bit full. So you may need a step down into the 12 inches of water...
Hmmm not something I'd thought of. I'll have a talk with my PB when he's here excavating. Thanks for the heads up.