A lot more time has been spent on the issue than you probably imagine. The glow had been fixed for a while but the fix caused other glitches, e.g. some objects disappearing, making at least one puzzle unsolvable without switching to Z3D, which not everyone had the idea to do in the right moment. As far as I’m aware unfortunately it’s impossible to have both glitches fixed, it’s either one or the other. In the end the weapon glow was the lesser evil.
I’m not 100% sure, but I believe you can holster the weapon, which should largely mitigate the issue unless I’m mistaken. Also the camera height modifier (under ‘More 3D Settings’ in the vorpX menu) is always worth a shot to get weapons out of sight.