IIRC, the Israelis have KC-135s. However, I think any attack on Iran will be a US action. Attacking and destroying Iran's nuclear capabilities is within Israeli capabilities. But that will only lead to Iranian retaliatory attacks unless the United States also participates to destroy the Iranian armed forces' and the Revolutionary Guard's offensive capabilities. Doing this would require a concerted air campaign lasting weeks or months. The United States is the only military power capable of doing that job.
I think you are right that it is definitely a bigger job than is realized by most.
I have read that the Iranians have disbursed their nuclear manufacturing capability to over 300 sites in Iran, many of them underground and well protected.
We may be witness to a conflagration of biblical proportions this year.