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At 4 weeks he will be just fine and independent.This is they age the would normally be separated from mum anyway though usually in to single sex sibling groups. This has the benefit of letting them grow in a group and keeping each other warm so you need to enxure that as a singleton he is kept nice and warm and with plenty ripped tissue bedding. Feed lots of seed mix and add in small bits of extras like boiled egg, tofu, chicken, babyfood, porridge and small chopped veg (one sort per day) I wouldn't give the wheel for now and save this till at least 12 weeks when he has grown. You don't want him running all his energy off!