I know a lot of people say [name]Erin[/name] as [name]AIR[/name]-in/en, so [name]Aerin[/name] would work
Some ideas are :[name]Erinn[/name], [name]Eryn[/name], [name]Erynn[/name], Arinne, Aerynne ,[name]Aren[/name],[name]Arin[/name],Airen,Aeren, &[name]Eren[/name]
The source of [name]Erin[/name] is Eireann, I think
I actually think some people might get your way of spelling it.
[name]Aaron[/name] & [name]Erin[/name] are two names that people bungle the pronunciation up anyway, because of accent, so, I think you can go for it