Big teams in small countries are a good way of doing so. And you are right, Ajax, Benfica, porto and PSV Eindhoven are good teams.
The first thing you'll want to do is scour the transfer and loan list and look for players that can be beneficial. Set up some links with some smaller clubs to benefit from their youth system and loan deadwood players from bigger clubs, eg. Mahamadou Diarra from Real Madrid maybe.
You could also try improving your own training and youth facilities so that, when you become a much larger club, you can benefit from an established youth system and be able to compete with young up-and-coming players. There isn't much need of harbouring off other wonderkids if you have your own crop and your facilities aren't up to scratch.