This is a question you can only ask if you've never read the actual rules for biaxial alignment in 1st Edition AD&D.
Alignment under default rule has always been a continuum, with there being room to move around in each category. Some of your finer-grained ideas, like detection spells returning variable results based on how strongly a person is aligned, have been actual parts of the rules for several editions, with multiple different variations!
So, like many other takes and fixes on alignment, yours is based on a strawman built out of popular misconceptions, not any genuine rules. You want to talk alternate alignment rules, pick an edition and read through the actual rules first.