... By leaving the country with , of course, my UK PP, entering with my IRISH , paying the 30 day VOA
You first need to cancel your KITAP (getting an EPO/Exit Only Permit) , otherwise you cannot come back to Indonesia with a VOA/Visa-on-Arrival .
and having the KITAP moved to my IRISH.
So if you do the above , there would be no KITAP anymore .
I was told by changing my Nationality??? I would need a NEW KITAP???
Assuming you have now 2 passports (UK & Irish) , I think it would be fair to just request a process to change your passport & related data in your KITAP's file , keeping the present KITAP of course .
But as we saw already Immigration charging for a new KITAP when people changed the KITAP's sponsor , it is no surprise if they require the same in your case too . NEW means you will have to request the same KITAP process again & pay again of course . If you still decide for this change (and assuming you plan to get the unlimited time KITAP next) , you could wait until near the expiration of the present KITAP , then you just submit the KITAP extension's request with the Irish passport (avoiding the troubles of doing the passport change now) .
UU no.6 Year 2011 - Immigration Law
Article 71 - free translation
Each Foreigner residing in Indonesia must:
a. provide all necessary information regarding the identity and / or their families, and report any changes in
civil status, nationality, occupation,
sponsor, or a change of address to the local Immigration Office; or
What are the Government regulations concerning this. ??? Rules Regulations etc etc ???
I am not aware of anything in the Law or Regulations (I am not a lawyer but know most of Immigration rules) that specifically applies to your situation .