Quick combination or text replacement for typing schwa

I would like to configure a simple key combination to type a schwa (ǝ). I configured text replacement for the å character, but it won't work if it's inside a word i.e. "å" gets replaced correctly to "ǝ", but "andatå" doesn't become "andatǝ". Good solutions would be: - automatic text replacement for the å character - a way to assign ǝ to the option+a key combination My keyboard has the Italian ISO layout.