Polymath 2.2.0 Update (Patreon)
Content
Polymath works as desired for weapons! There appears to be an additional command that I have to run on one of the game files (root templates) using LSLib to ensure that the weapon's name and description show up appropriately in-game. This will hopefully be something easy to figure out. If it looks like more time than it is worth for now, the issue resolves when packaging the mod with BG3 Modder's Multitool. I'll aim to do everything through Polymath to save you all steps. Having the Multitool is not necessarily a bad thing to have in your pocket too, the developer has done a good job putting together a fairly robust tool.
I tentatively only have one more bug to sort out, which is ensuring that you can give custom weapons AND custom armor, versus one or the other. This is due to how I merge the data structures that contain this information. It should not be that hard of a fix (and will hopefully work in-game without any additional fuss).
Once I fix this, which will hopefully be in 1-2 days, I'll release the beta version here and then start putting together the video. Thank you for your patience as I resolve bugs!