You may as well keep the IFS if you want adjustable suspension and 33s. The reason most folks want to go with a SAS/SFA swap is to fit larger tires, increase reliability of the front end components and increase suspension flex/articulation, none of which the AHC/IFS system does well.
If you go with the solid axle swap, you will ditch the front end components which include the torsion bars and also the hydraulic shocks. I wouldn't imagine that it is feasible, cost effective or make complete sense to keep the AHC system while swapping the front steering and drive components.
To me 33's and a solid front axle is the perfect combo for articulation and flex... I have done pretty much every trail in Northern California with that combo.. With the addition of the AHC you can adjust the system. Why can't you just reuse the springs and hydraulic shocks and adapt them to the solid axle? I bet since the 200 series doesn't use the torsion system, it is feasible.