As far as the steering is concerned it is the front end that is doing the heavy lifting. If your target bike also had a 72 degree steering angle, putting a different fork on it would get you there, but the fork has to be designed to have the same height, the extreme would be putting a 29er shock replacement rigid fork on there!

Kogswell did a lot of messing around with fork angles and even stocked some Porteur forks with different angles in various wheel sizes.