you can replace the core support without discharging the AC. in fact, you can swap a whole sealed and working AC system over to another truck without opening the system, which is how I know it can be done because I swapped the system from a 98 blazer 4x4 to a 98 blazer 2wd.
your frame rail is almost certainly bent, based on the position of the drivers side wheel. I recognize that lean, had one hit almost the same.
other than that, it will be pretty quick to swap front ends over. If you try to do it complete, make sure you take the tires off, you can pull it in one big chunk that way.
a frame shop can straighten you out.