I'm here in Iran from almost 1 year. The security situation in Iran is far better then Pakistan. So, dont be worried about being robbed because its safe from this point of view. As far as Balochistan is concerned that might be problematic from this perspective. You can adopt many routes, but better will be the following one.
From Maku you will travel to Tabriz, from Tabriz you will go to Zanjan, From Zanjan to Tehran From Tehran To Esfahan, From Esfahan To Kerman, (Or from Tehran To Yazd and Yazd To Kerman) And From kerman To Zahidan.
Note that Kerman is the Iranian province close to Pakistani Balochistan, (Actually Iran has its own province with the name of Balochistan, and they call it Kerman-Sistan-Balochistan), and after crossing Kerman the security might be very much tightened up because of different territorial problems.
And there might be another problem. expectedly you will be travelling through europe on your british/candian or American Passport, but remember Iran can give you visa on a Pakistani Passport but never on a wetsern passport. Even if they do it will be after a lot of trouble.
Also remember that Iran is a very big country almost 3 times bigger then Pakistan and you will enter from one end and exit from the other along the largest dimension of the country.