I tell you concept of my Pronunciation System.
In this system when you see the numbers you simply Pronunce the number and then you get a word ,store in your memory palace.
Example - Persian counting numbers.
1. Yek - Yolk (when we Pronounce we get a
same sound word )
2. **Do** - Dodo (bird)
3. **Se** - Sex
4. **Chaahar** - chair (you can also see 4 legs)
I don’t know Persian language otherwise I give you pronounciation of these in Persian language.
Note- you can also select yak (animal)
When you memorizing the number and suddenly you forgot the number that time , you speak very fast counting numbers in your mind and you get it.
Like - 20 - Bist - sounds like bees
This advantage you didn’t get in major System because when you forgot the number then that time you have no choice
And recalling also slow.
If practice Pronunciation system than you can easily do this without some letters assigning
Example - 4566 - when I see this number I simply speak the number and I got it.