All my current road bikes have 73 degree heat tube angles and 43 mm offset forks (23 mm tires). That gives a pretty standard 58 mm trail which works well for me. I am looking at a frame (only) that has a 73.5 mm head tube angle. It is out of production and information about what fork rake was originally recommended for this frame is not available. At least I am having trouble finding it. To get the same trail with this frame I would need a 40 mm offset fork. They are available but not nearly so common as 43 mm, especially at discount online sources and ebay. What would you guys recommend? Is the 40 mm offset fork the safe bet?

Just in case anyone might know the recommended fork, the frame is a Merlin Works CR in size M.