Fella the colour of your dog is the least of your problems..
If you can’t cope with a disobedient lurcher, god help you with a litter on the ground.
Not only breeding an unproven lurcher, you run the chance of breeding more white dogs..
I have a white bitch and have had no more trouble, than a man with a black lurcher.
My advise would be to give the dog more schooling through the summer months.. Back to basics and if its not working out, reassess if you have what it takes to be a responsible dog handler..
If you need to start over, a pup would be a wiser choice than a litter.