I do agree that the average British players are way overpriced but those are mostly the 21-29 category players who are already have a name in England. I think you have to focus the scouting in England on talents who don't get a chance at the top teams for example.
But I understand that a team also need a few stable players in the 25-33 range and I do agree with you that international scouting is the way to go for that type of players. And yes, the Championsship is attractive for a lot of players, but you don't have to forget that they also pay way to much money for certain players in the rest of Europe. Every league has a few "Madine" buys.
I think scouting in the Ligue 2, Eredivisie,Superliga can be an excellent idea, but you have to mix it up with talents in England. For me the dream is to develop the youth academy big time, but don't know if there's any budget for at the moment.