Not sure what the radius is for your 650 wheel, but if it's 310 mm (the 700c is about 340), the desired rake is 29 mm, not 41.

Can you explain how you got 41? Assuming r1 = 37.5 per the site, and the head angle is 73 degrees, trail as supplied is about 65 mm. Solving the trail equation for offset r2,

-r2 = T*sin 73 - R2*cos 73 = -29
r2 = 29

Just from solving the trail equation.

If you need to add 650 only in the front and keep the bike level (otherwise your head angle won't be 73 degrees), your fork needs to be longer, by the difference between the 700 and the 650 radii. Also needs a small adjustment for reduced offset. If your going 650/650, the fork needs to be shorter by the same amount to get the brake track in range of the calipers.