Jamie
You still will not address the issue of cost for everyone that trains outside a reasonable radius of Menangle.
To answer your question about moving to a barn at Menangle. I can't think of one reason why a country/provincial trainer would contemplate giving up an ideal training/living environment to move to a big barn comlex at Menangle. Who's putting up the dollars. It sounds like you, with all your available horses are looking for a trainer and you are going to bankroll him/her.
GOOD LUCK