You can use a fan to stimulate tomato plants any time after they are 4 inches tall. Yes, a hair dryer on cool setting would work.
Since someone is going to ask, all three of the tips needed are:
1. Grow your seedlings dry. Let them get so dry they wilt at least 2 times. This stimulates the roots to expand and they keep expanding as the plant grows larger.
2. Let your tomato plants go down to about 40 to 45 degrees (5 to 7 Celsius) at least once as seedlings. Bring the temperature back up over 90 degrees (32 C) the next day to reverse the stunting effect. Cold temperatures stimulate a tomato plant to produce much more fruit compared to hothouse grown plants.
3. Use thigmotropy to produce sturdy and hardy seedlings as per above.
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