Will update shortly... and so after the tweaks I 've done and tests, I concluded:
1) Radio stations were playing fine, no changes here
2) Added the new HLS stream from akamai for ERT1 (Greece only)
3) To play the rest of the live streams flawlessly use Kodi Krypton (or Leia), activate inputstream adaptive, MPEG-DASH on youtube addon and you should be fine, I am providing direct shortcut from ERT Player's context menu for the latter, you should be able to do all that from there
4) I added Python 3 support (Leia+). Sorry couldn't help myself!