I see that this is now available as a PC port from GOG, any idea if/when the category would be available?

The only version I see on GOG is the MSX version. This board is for the NES version. Unless dunnius wants to answer that here, I would post this over at the MSX board

Yeah this belongs over on the MSX boards. There has already been talk on Discord about this, and if you are interested in speedrunning it, then post a request for the category and it will be added.