I've never liked the original font for ingame texts and menus.
It's understandable that you don't like it, it's the PlayStation BIOS font, which was used in most cases just for Japanese games that didn't want to implement a custom font and still have as many glyphs as possible. Most western people don't like it either, it's massive and kinda ugly.
Do you think it would be possible to add the letter font to the game's menus?
Possible yes, easy not at all.
Besides, such visual changes may not like the rest people. For example, I do not like the font in the screenshots of your links. It is too compact and small.
Then people got legally blind at Harmony of Dissonance, Aria of Sorrow, Dawn of Sorrow, Portrait of Ruin, and Ecclesia, since that's the font used in all those.