While looking into wonderswan, I found out that Bandai and Qute Corporation made this dev kit and held competitions called WonderWitch Grand Prix which helped bringing many games and developers to commercial level (more details in the link). There are a lot of games that are still locked in this kit that were created during the 2001, 2002 and 2003 Grand Prix, which also contains "Self Produce" made by M-KAI (creators of "Judgement Silversword").
My intentions are to throw this idea out there for someone to make it happen. Also if it already works on MiSTer or if there is a way to convert the WonderWitch rom files (.il/.fx) to .ws or .wsc files, please let me know.
http://videogamekraken.com/wondersawn-wonderwitch
https://wonderswan.fandom.com/wiki/WonderWitch