Okay, I've started a tier-5 systems overview list: http://tm.teresco.org/forum/index.php?topic=1776. Dunno if there's any new potential country-wide tier 5 system except Norway, Sweden and Denmark.
I've not checked smaller countries because I think we need a better solution if most of the larger countries do not have potential tier 5 systems - it currently looks like we don't have systems for 4 out of 5 countries with most inhabitants (DEU, ESP, FRA, ITA).
"Larger" countries I've not checked:
- BIH, GRE, IRL, SRB
It's often just required to check if they are signed anywhere in the field.