I would say most of these figures are unrealistic. You would maybe attract the odd neutral fan but 5,000 + just seems crazy.
10,000 English fans? Sadly Motherwell is not that a big draw and you would be very lucky to get 2,000.
5,000 pseudo Well fans? They would be happy just to watch it on the telly.
10,000 true well fans? Just stick them in Fir Park and create a great Euro atmosphere