Craigcubed- Anything is possible Really with designing the rigid fork just so you can come close (or spot on, I'm not going to do the math) to your head angles and adjusting the rake will finalize the handling with the rigid one. Perhaps choosing a geometry with the suspension then seeing how much head tube drop equates with how much head angle change then seeing what a rigid fork will get you. Another aspect of the wheel/fork swap outs is the BB height changes and don't forget about the seat set back will move more forwards over the BB with the potential shorter rigid fork.

Perhaps the larger question is how you'll find all these changes and whether you'll be happy riding long hours with both set ups. By my take the body positioning change might be the biggest issue. Of course this depends on how much shorter the rigid fork is. Andy.