There's nothing new about pulling a headtube back into place, except that it's usually pushed into place with this long-discontinued Park tool; the HTS-1:













So long as the frame tubing is not air hardened or heat treated, either of these methods are pretty safe. Get a load of this hi-ten frame that was straightened as a long-tem experiment:





It is actively being used as a commuter today, with no ill effects or further tubing damage, despite that crease on the top tube. Most steel tubing is a lot more resilient than most folks here seem to give it credit for.

FYI, it is preferable to insert temporary headtube cups in the frame for a tight fit with the Park tool, and to prevent ovalizing. Use steel cups that are overbuilt; they work well.

-Kurt