there were most weapons that are FBX models from Sketchfab such as keyblades, guns, katanas and such. my main focus is to find a FBX model of Soul Edge from the Soul Caliber series. mainly the SCII Soul Edge
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so using the d4rkavataroptimizer has some limitations because whenever you use VRCFury it wouldnt let you compress the files, and avatars who have VRCFury is another difficult task to handle. so you either need to compress the avi first before putting VRCFury or remove anything related to it before compressing
more than likely so, i have tried to convert that myself but you'd have to reset the model to its default pose and make a fresh rig for the model which is a pain
good suggestion though @ThingieReal