What are the times suitable to make Indonesia a nuclear state? I'm sure it's in Soekarno's era and before the Southeast Asian Nuclear-Free Zone treaty was signed, but I don't know exactly.
I rather think any Indonesian nuclear facility under construction during Bung Karno’s period in office would have received a visit of the very unwelcome kind in the wee small hours of the morning.
A communist Indonesia would probably try to get nuclear weapons, thus sparkling a race in the region. As mentionned before, Australia would definitely get the bomb in this scenario, so would Taiwan and maybe Malaysia and the Philippines.