Yes, there are Baluchi's there, but also other Sunni groups. Agree there would be some ideological differences. And external influence (Look north and west). Baluchis have always wanted their own place. They are a pretty big ass tribe sitting on some valuable land. Here is what they claim. Some pretty damn important ports, but also a lot of Chinese investment.
No, it would not look good, and why I said no US troops. Canadians, Nordics, they do not carry the animosity. Sure high level of force protection, but it can be done. That is why you have contractors to protect those sites.
Israel? yeah, they are not going to pay shit, but the Gulf Arabs will. They can fund reconstruction. They need the good press in the Shia world. Let each country adopt a province. They will try to outdo each other so hard.
Risks-
Iran breaks up into regions controlled by warlords. Make sure people have jobs and they tend to not fight. We failed at that in both Afghanistan and Iraq relying on third country nationals for even down to the most basic jobs.
Limit the Influx of foreign private capitol from Iranian diaspora. This tends to change the national make up a lot. Limit what they can do. If you create an Iranian first policy, make residency a requirement.
Return of the Clerics at the regional level to keep being angry. Why are they angry? Invaders and they lost power. So limit the number of international (ie White) troops, and let them have roles. Again, we imposed religious leaders in Iraq and Afghanistan.
Also, embrace Persian legacy. Make people proud of. Teach the Rubiyat on TV. Etc... Again, we stifled both in Iraq and Afghanistan trying to push Western culture.
And at the regional level, well shit, if one province wants women to have their hair covered, so what? Not every state has the same laws. Allow that. It will slow down the calls for Radical growth.