If it were about 30ma or less I would have suggested running the regulator directly off an i/O pin on the MCU.
To contradict that statement, I would never consider using an I/O pin as a power source for a "circuit", an LED or other single low current component "maybe", but to be used for generic "power source", I call that pin abuse.
My philosophy: Output pins are TTL High/Low "signals", not power sources, that "tell" other components to do some work.
Considering removing the "magic smoke" from an $0.11 transistor versus a $5.00 MCU... the math is easy.