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Well, the same idea still is true.
Usually the actual printed name window is text strings, and then there's a separate data table indicating which character each spot on the window represents.
You'd replace each with blank space.
(well, changing the selectable portion of the menu is a better option. But that's an advanced thing usually requiring ASM hacking. Replacing data with spaces will have to do though if that is not an option. )
I didn't see a naming screen in this game.
But anyways, you replace the font. There's usually a separate table for the text on the screen (like text" A B C D E F") and another table for which character each slot on the name window represents (ABCDEF).