The existing FE4 map sprite editor can do this. Just change the character value to 00 00 and the proper map sprite will work for any (male) character assigned to the class.

https://i.imgur.com/tq06CZ8.png

Result: https://i.imgur.com/92ibtTn.png and https://i.imgur.com/2MBJqaL.png