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.

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@NichG:

To implement your idea, the only change required to the existing 1st Edition system is literally just replacing the names for the axes with names of deities. The system already tracks standing with gods and afterlife.