remembering more trans yuri i'd forgotten. the options are kinda dire but there is some stuff. there's a bit more if you expand into het, but even so there isn't much

• those 2 chapters of mermaid line (handle the trans stuff clumsily but idk how much of that is the manga being from 2009 or the translation being from 2009)
• wandering son (focus isn't the relationship but the main character is a trans lesbian who does get a girlfriend)
• a manga about a hero who pulled out the holy sword and became a girl (just a 4koma but it's there)