If I may, and while I commend you for your all-belgian team, when you reach that point where your team is not perfect, but almost, you shouldn't be looking for a belgian player to fill in that very last spot. You should be looking for a player with the right profile, no matter what his flag is. Otherwise you'll surely overpay, but most probably won't AT ALL find what you're looking for.
In the end you're trying to achieve the very same thing than your opponents but with a much smaller player basis, which is increasing the challenge to unseen levels.
I'm sure that if you hit the transfer list looking for skills instead of flag you'll find what you need. Your merchandising is good enough thanks to all these belgian players anyway.