I am thinking this system out as I go so it is [CREATIVE THINKING]
when the numbers are entered in my software a key pair in the number will appear that determines what number to enter. After entering the number that number will shift to current drawn.
If a pair other than the key pair in the number hits that number will not shift to current drawn.
This does not say that a pair other than the key pair will not hit as the digits are tracked in threes. So a pair listed has the same probability as the key pair.
So when tracking I am tracking the three digits as well as the key
pair(s). This factor could be used if needed to reduce the amount of plays.

The key pairs are listed here.

key pairs hi-lo wheel
HI_LO
_#__pr
013 01
023 02 03
024 04
123 12-13-23
124 14-24
134 34
------------
568 56
578 57-58
579 59
678 67-68-78
679 69-79
689 89

key pairs even_odd wheel
even
_#___pr
026__02
046__04-06
048__08
246__24-26-46
248__28-48
268__68
odd
137__13
157__15-17
159__19
357__35-37-57
359__39-59
379__79