In all honesty, I'll probably have to come up with a solution for the 8x8 text the game uses beyond just using the game's 8x8 font. There isn't enough room on screen for everything in a lot of places, like the HUD, menus, system dialogs, and so on. I don't know if there is enough free VRAM space for a variable-width small font, either.
Even just the in-game HUD itself, that bottom-right window, is so cramped in the original that character names, the number of dokodemo/suit yourself cards they've collected, and the suits they've collected actually run together into an unbroken string of tiles, filling the entire width of the window. There is precious little space there, and absolutely no room for 5+ character names without some changes.
So after considering it for a while, I've realized there's only about 160 tiles, max, that I could use in VRAM for a dynamically-drawn 8x8 (or 8x4, in this case) set of text.
I don't know if that's enough tiles for text-heavy screens like the stockbroker screen, status screens, menus, etc...
I'm worried again that this project might end up being just barely not possible to do well, and we'll have to make some sacrifices...