What is happening with Reynolds forks is true...the whole line is being re-done, they are much less "after market" friendly (and therefore less friendly as OEM equipment for framebuilders.). In addition they are all being designed primarily for integrated headsets which means they will look yucky on a sweet frame like a Moots.

The difference between 44mm of rake and 45mm of rake is 1mm. 1mm! If you can feel this in how a bike rides I will give you a fork! That is nothing, imperceptible. Add to it the variations in QC with carbon forks, there is a good chance your 44mm fork will actually be a 45mm, and vice versa. Don't sweat this.

The number your builder pays more attention to when making the frame is called "trail" and it is a derivative of both the fork's rake/offset and the head tube angle. Assuming a head tube angle of around 72.5 degrees, you have a trail number of 59 or 60mm depending on which fork you use and 700 x 23c wheels. That is a great number, and the bike should have great front end handling for any fork in this offset range..

I hope that helps.