If it feels comfortable and you like it, keep it and just get used to playing it. In time, it will feel just as normal.
Regarding the "necessity" aspect of it - while you may only use 3 strings while you're with your band, how many are you limited to when you are not?
Also, here are pictures of me singing while playing one of my 6-strings and my 8-string. It feels equally natural to play and sing on both with no string fumbling.
