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@yoav
The first question is why? Changing the rake for the same head angle will alter the bike's handling and not necessarily in a good way.
If you look at the forks, the lower part of the blade is round but the top part is oval. The rake was formed by bending the fork blade against a curved form at the point where the oval becomes round. That's where you need to bend it and the straight part needs to be supported.
Trying to bend it near the crown risks breaking it as the long axis of the oval cross-section of the tube is designed to resist bending. In any case, you'll have backward pointing forks which not only look odd but are probably weaker.
You will also need to make sure you bend both blades by exactly the same amount.