Did you tried memorizing by your system ??
I guess you are just thinking that these rules will boost your speed. But in reality this will decrease your speed.
Yeah you said it tooks you weeks to make it, If someone read all details in some minutes, they will not realise the effectiveness. But I am saying really it’s not useful in faster numbers memorizing.
And 1 most important thing you will not able to use this effectively in spoken numbers event.
eva - 868
Zoe - 023
bee - 932
if you think short word will boost speed than it’s not, you can read ben system, although in ben system words are short but do you think short word will increase your speed ?, Okay at one point it’s true, but above your examples sounds like total random.
Every case have different rules.
More like you made a lots of rules.
Last thing I will say is , I am not saying bad about your system, I am just stating my opinion in your system. Because I use letters system in numbers as well, and I tried lots of approaches. (first thing & most important thing, you made literally lots of rules 
)
I use only y rule, and I am using it before reading your system. looks like we both reach at same point here , in y letter.
But here too, you said
553 - lily (so basically your rule is different here and you added two rules for y letter.)