[codyb]

This is very similar to Dominic O’Brien’s techniques for remembering numbers where he assigns each number in base 10 a letter, then you go through and make characters and actions for each number 0 - 99.

So 0 - O, 1 - A, 2 -B... (with S for 6, and N for 9).

Then 00 -> Double O holding a pistol

OA - Your friend Oliver Anderson doing whatever Oliver Anderson does

Etc.

Then 0100 becomes your friend Oliver Anderson holding a pistol in your imagination and that’s easier to remember and you can make stories with your characters to remember phone numbers etc.

Once I started this comment I realized it may be just a tad bit more involved, but I wonder if you could combine the two and have characters for every number from 0000 - 9999.