As far as I know, they can put you on the register only for passports, but not for the ID card...So even though I understand that you may want to travel outside of Europe, at least the ID card will let you travel in Europe. Unfortunately, I am in a similar position as my passport renewal is coming up in November and I owe some money in taxes. I've been trying to make arrangements with them for 6 years now, but some of the debt they want me to pay in one go, and those are going in the hundreds...so at the moment I can't afford it. I don't think it's possible to see the register, so I will only find out if I am registered in November....I wish you all the best with this, and hope it will work out OK soon. Much love xx