Need Advice on Standing Predicament Setup

Hi everyone, I’m looking for some advice and input on a session I’m planning. As mentioned in my intro, my wife knows nothing about my secret hobby so I can’t ask her directly. The scenario I have in mind is based on the standing predicament. My first question is how large should the blocks be? Secondly, it’s a bit more embarrassing; I’ve never worn women’s shoes before. So I know absolutely nothing about them! Can anyone recommend a style and what heel size I should go for? As for the scenario itself, I was planning to use a crotch rope arranged so that my balls are separated. Then I plan to tie them together and attach them to the same hook as the nipple clamps using a piece of strong elastic to prevent any serious injury. Secondly, I plan to use an anal hook and connect it via another piece of elastic to the handcuffs. The third change I have in mind is hanging a sealed bottle above head height. The bottle will have both a breather hose and a drain hose connected to its cap. The drain hose attaches to a spider gag so it sits at the back of my mouth, preventing me from stopping the flow manually. The idea is simple: I step off the blocks, the bottle tips upside down, and the contents flow unchecked into my mouth until I step back onto the blocks. The only problem I have is how to keep my head from dropping forward and allowing the liquid to run out? So there it is! I would like to hear from anyone who can give me any advice on this matter other than ‘are you mad? Don’t do it, you fool!!’