I have a task to limit visibility of some GL account (like Salaries) to special roles only. Natively Netsuite can't do that. What custom solution could help here?

If you were to get suite people it actually can do a bit of that for you

I know, Advanced Employee Permisson, I guess it's a great feature, unfortunately SuiteitePeople is available for US only (maybe UK also?) and I'm not from US.