I do not think you require a child for the purpose of example. You had one child, and by the desire of Krsna the child did not stay. Now you can forget of any child. Just do the present service with great care and affection, that will be your best service to Krsna. Better to accept Krsna as your child, and He will never leave you like material child. He will stay with you forever.
For raising children in Krsna Consciousness, you will get many opportunities to do so. When I was householder, I was just taking care of one or two children, but after retiring from my household life Krsna has given me chance to raise so many nice children for raising them to Krsna Consciousness. So instead of desiring to raise a bodily child to Krsna Consciousness, if you stick to this service, Krsna will give you many children for that purpose.