Hi Beth.
It’s a pleasure to answer your questions (they are very simple questions)
The pistachio is an extremely tolerant crop with cold and heat, since it withstands very cold winter temperatures (-30º celsius, and if I’m not mistaken, it would be -22º Fahrenheit), and the pistachio tolerates very hot temperatures (50º celsius, or what is the same 122º farenheit)
Even using a less vigorous rootstock (like the ones you see in my photographs), which is pistacea terebinthus, they have very deep taproots and are not suitable for growing in pots, even in very large pots .
It can be done but it should not be done because this matter ends badly, since the male varieties are infinitely more vigorous than the female ones and if they are grafted at the same time the male variety ends up absorbing the female variety.
What you proposse, is done in the following way , the female variety is allowed to grow for about 4 years (tree formation period), and once the tree is formed, a male variety is grafted onto the end of a single tertiary branch of the female variety, in this way It pollinates perfectly, but it does not reduce the vigor to the tree with the female variety.
Regards
Jose