Seriously though, I second Štajerc. Ə or è would be best IMHO.
Ok thx. I thought of ě becouse i don't mind for what purposes others use it. Well i didn't thought of è so yeah it's pretty cool choise while Ə is not what i want altho its use precisely for halfsounds. However Štajerc isn't this è used for other variant of normal e?