The Graphics Mods section of the wiki says that the mod was tested on 0.40 and is working correctly. The MCP page on the Wiki does list the MCP fixes:
However, it doesn't say if OpenMW includes this fix.Polish keyboard support. Allows typing of Polish characters in-game.
Polish character corrections. Corrects dialogue font Ó and c (they normally display as O and é) when used with Better Dialogue Font Polish version
Is this fix in OpenMW? And if not, is there an alternative to get better fonts in a way that correctly displays Polish characters?