This the result (before and after):
It looks still wrong because I didn't edit properly all the RAM, but you get the idea.
Is this a good start? I'm not sure how to translate this to a permament change in the ROM, though.
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you might be able to expand the number of text-boxes by adding '0A' after the terminating 'FF' byte for the text.
You would have to use the debugger to track down the lines of code that displays text to the screen and change it so that it treats each character as being less tiles than it currently does.
Unfortunately the only one I know of for Wonderswan is one of the many emulator mods that Guest created for various consoles many years ago. While it was great he wanted to help more obscure consoles get debug tools, his debug mods are rather cumbersome to use.
then the total address is (segment*0x10)+offset, which does indeed give a 20-bit range but means there are 4096 different ways to address the same byte