The problem is that you're all thinking along the lines of conventional bikes. Steering geometry is well known with those and fork rake is in a very narrow range. With long wheelbase recumbents, it's very different. There are only a handful of such bikes with large front wheels. Do a Google image search for "dual 26 recumbent" and see the long wheelbase models with direct steering, not remote steering. Look at the enormous amount of rake their forks need because of the slack head angle needed to keep tiller effect manageable. We're talking four to five inches of rake, not a couple of inches like a standard fork. I'm sure if you have the resources of a bike company, it's easy to build as many prototype forks as you need. Those companies don't disclose their frame geometry, so it will be just guesswork based on pictures for those who want to try to roll their own. Don't judge if you're not familiar with this field.