Welcome aboard! I play the G Major chord 2-1-3-4, so I'm fretting the B and both E strings at the third fret... that's just the way I learned it. There's nothing wrong with leaving the high B string open. I'd stick with what feels more natural, 2-1-3 rather than trying to force using your pinky, and then let need dictate the fingering from then on. In other words, if you find yourself learning something that requires you to change the fingering so you're using your pinky, practice that and use that fingering in that context. I've done this with my acoustic... I came up with a little instrumental that due to the fingerpicking, required me to play a D Minor chord differently, (I needed to hold one note as I changed from G Major to D Minor, and to do so, required me to finger the D Minor differently). Initially, it felt really weird to play the chord differently, but with practice, it became easy and fluid. I only use that fingering in that song though; if I play the D Minor in something else, I use the normal fingering. So moral of the story, I wouldn't force something that feels really weird when there's no apparent need for it.

Hope that makes sense!