As you mentioned back then nothing worked.
Even with the best non l2j datapack that existed at that time.
Luckily for you I have that datapack and also added some stuff like PvP / Karma from L2jFrozen.
Also contains some form of water and breathing by region.
L2j sources included. No compiled crap.
https://bitbucket.org/MobiusDev/l2j_mobius/src/master/L2J_Mobius_C1_HarbingersOfWar/
Server includes "crazy" fix for multiple clients from the same PC. 😛
Client link in readme.txt
