is it possible to connect several uC to one FT232 (or a "master" uC)?
If so, where would you put pull up resistors?
Theoretically you can connect two µCs to one FT232 for reading but only one can control the TX line, else you produce a short circuit (one µC is holding the TX low, the other goes high). You can insert resistors in the lines to eliminate that problem electrically but you still have the problem of concurrent writes.
In your case the power cutting µC doesn't need more than reading the serial line, so you should be save with that.
But as I already wrote, with a clever programming and maybe a bit help from interrupts you don't need it and have full control within one µC.