All done, except for:
GRC EO3
OSM shows a branch through Kozani. Should it be added to HB?
It's the mainline - rerouted EO3 that way (truncating EO20), but left E65 on bypass.
GRC EO7
Rename A5 to EO9A
No, as it meets the A5 there, even if it is just a tiny stub (with the EO9a not having been upgraded).
GRC EO16A
According to OSM, there is also a EO16B, parralel with EO16A on the last part.
I can find no evidence of its reality.
GRC EO18
According to OSM EO18 has another Route, much more inland.
So this is a right mess. Apparently the E55 follows the EO18, and the E55 certainly takes the coastal route. Some tile maps show the inland route as EO19, which doesn't exist. There's the EO102 along the same coastal corridor, though Greek Wikipedia says it is slower as it is a less good road going along the coast, assuming EO18 takes the E55 route. There's also the EO18 reaching the Albanian border.
What I did: convert the E55 route (and the shorter link to the EO21) to EO102. Rerouted EO18 via the inland route to Albania.
Rename Nic to EO18AST and add EO18AST to the HB (the link to the EO21)
I don't think even in the most anti-German Greeks, they are being forced to speak German!
. OSM (and Greek Wikipedia/1998 Greek Goverment list of roads) has it as EO102β, so I have it as EO102B.
GRC EO39
OSM shows the parallel, more important road south of Tripoli, also as EO39.
Majority of tile mapping sources have it as an unnumbered route (including OSM other than a short segment). Rerouted E961 over it, left EO39 through the towns.
GRC EO85
Are you sure it goes until the WP End?
Yes, from description on Greek Wikipedia, and on ESRI tile mapping
GRC EO108, EO111
Cannot find evidence that this routes really exist.
Greek wikipedia, citing a Ministerial Decree (see also EO102).