Did you remove the sway bar links? That will give you a little more room.

When I did my 07 I ended up removing the lateral arms. The bolts wouldn't move and I had to cut them. That was the cheapest route.

 

My rear struts do not have sway bars attached to them (Only the front ones do). It connects only from the Upper mounting nuts and the shock absorber lower mounting bolts.

 

... So far I was able to remove that specific nut, holding the lower control arm to the end of the threading. I tried penetrating oil, hitting it with a sledgehammer and heating it with a small blowtorch.

Are you saying you were able to get the nut loose, but not all the way off the bolt? Or is it that you got the nut off but can get the bolt out of the assembly?

If the threads at the end are dirty, try backing the bolt up and taking a wire brush to the threads to clear them.

If it's just the very end threads that's damaged you may have enough room to cut that part off and still have enough bolt left to use until you can get another ordered.

If the nut is off and the bolt is stuck, try walking it out with a ratchet.

 

I'm able to remove the nut completely but I left it on to hit the bolt with the sledgehammer without damaging the threads.

I'm not able to remove the bolt at all to lower the control arm to make room for the suspension.

 

Use an impact...