Hypothesis regarding small alphabet

[ViolaGuy32]

It might be possible, but as you say when this happens in language there is a way to tell. Without this way everyone would be lost. 
You could add a way, like hide "12212" in the text which tells the reader the rule is option 1 then 2 and so on, repeating.   

I think the observable preferences and rules to the text would still be there in the end though, just doubled.



EDIT: Also, Hello and Welcome!

I'm not sure I understand you. Someone who understands a script with this phenomenon would intuit which letters would make sensible words in each context.

Regarding your statement, "You could add a way, like hide "12212" in the text which tells the reader the rule is option 1 then 2 and so on, repeating," the examples of Arabic with only the rasm do not have a key or code hidden in the manuscripts informing the reader on which letter is intended for each glyph; the reader must intuit the proper letter on a case-by-case basis.