OK, but why deleting all the stuff for the Celts? Maybe they should also have an option like the Romans? So they may develop "in-line", with building lots of stuff like temples etc., but also when the time comes...
What about modding the Celts a liitle more, and adding something like this (without deleting anything):
;Unconditional Celtic Reforms
monitor_event FactionTurnEnd FactionType scythia
and I_CompareCounter Celt_Reform = 0
and I_TurnNumber > 120
set_counter Celt_Reform 1
terminate_monitor
end_monitor
monitor_event FactionTurnEnd FactionType scythia
and I_CompareCounter Celt_Reform = 1
and I_TurnNumber > 240
set_counter Celt_Reform 2
terminate_monitor
end_monitor
monitor_event FactionTurnEnd FactionType gauls
and I_CompareCounter Celt_Reform = 0
and I_TurnNumber > 120
set_counter Celt_Reform 1
terminate_monitor
end_monitor
monitor_event FactionTurnEnd FactionType gauls
and I_CompareCounter Celt_Reform = 1
and I_TurnNumber > 240
set_counter Celt_Reform 2
terminate_monitor
end_monitor
monitor_event FactionTurnEnd FactionType britons
and I_CompareCounter Celt_Reform = 0
and I_TurnNumber > 240
set_counter Celt_Reform 1
terminate_monitor
end_monitor
monitor_event FactionTurnEnd FactionType britons
and I_CompareCounter Celt_Reform = 1
and I_TurnNumber > 480
set_counter Celt_Reform 2
terminate_monitor
end_monitor
IMHO that should be placed just before the "settlements" section of the code...
Bookmarks