I'll wager you'll be happy with the appearance, but it may not last as long as you'd like. Usually, rear routes are used when you have a fancy wood that you don't want to cover up with a pickguard. But, pickguards exist for a reason: your fingernails or pick(s) will tear up a finish over time. So, when that happens, if that bothers you, you either re-finish or add a pickguard. Although, since it's a bass, perhaps there's less risk of tearing up the finish. I don't know; I'm not a bass player.