Welcome and congratulations on your new family member. If Nigel is already crate trained, you shouldn't have any trouble with him sleeping in it while you're gone. It's the safest thing to do for him and for your stuff. He's already 5, so while you're sleeping during the day, he will likely snuggle with you while you sleep.
Just be very aware (as I'm sure you already are if you've been hanging out here for long) Basenji are notorious escapists. If he finds a way out, plug it ASAP.
Your B-boy will love you for giving him a loving and fun home. Thank you for giving him a chance at love.