Um... you can totally edit the EBBS_SCRIPTS to make it way earlier. Ive done it twice.

When you get to that document, press control+f

Type in "unconditional" and press the find next button 3 times.

This will get you to the unconditional player reforms. Now this is what it looks like.

;Unconditional Player Reforms
monitor_event FactionTurnEnd FactionType seleucid
and FactionIsLocal
and I_CompareCounter Romanii_Reform = 1
and I_NumberOfSettlements seleucid > 89



In the last line, change 89 to whatever number of provinces you wish. It will activate only after polybian reforms.

*note* 89 provinces actually means 90. So whatever you put in, you will actually need 1 less.

Its quite easy to do yourself, as I am an idiot when it comes to this stuff and I know how to do it.

Enjoy.