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@Mikenetic
It's a gradual change in characteristics that sit on a handling spectrum, but it doesn't take that much change in measurement to move things noticeably.
You're altering two characteristics with changes to the fork length and rake; the head angle (as it's initially set against a presumed fork length), and the trail.
Head Angle http://www.bikecad.ca/taxonomy/term/128
Trail http://www.bikecad.ca/trail
Increasing the rake reduces the trail, which will make the steering feel "lighter" and the bike less stable at speed. For a given frame size, increasing the head angle will make the steering feel "faster." Further complicating things, larger tyres (say 28mm v 23mm) increase trail, making things feel slower.
Your best option would be to get someone to fabricate a set using disc-specific steel fork blades, matching the existing fork geometry.