1993 Toyota Camry EGR Valve Removal Problems

Okay, you all have been huge helps in the past.

I have a 1993 Toyota Camry 5SFE 2.2L Engine, Automatic Transmission. The car has a bad EGR Valve, or the valve just needs to be cleaned, the issue is as follows:

The top two bolts that sit on each side of the top of the EGR Valve are easy as pie to remove, but the large union nut (1")that secures the metal exhaust tube to the engine on one end, and the EGR Valve on the other, is rusted on each end and near impossible to remove.

My only option now appears to be to cut the piping, which would allow me to remove the EGR Valve. There is not enough space for even a good twist style adjustable wrench to turn either nut enough to loosen the pipe, and it doesnt help that the nuts are severely rusted.

My hope of course is that I can get away with just cleaning the EGR Valve, instead of replacing it, its an expensive fix.

My question then is:

After I cut the pipe and remove the EGR Valve, clean it and reinstall it, can I just put "heat tape" or silicon where I cut the pipe instead of replacing the entire pipe?

Its a cheap fix, but its a cheap car that just needs to make it till March at most.

Or do you have any other ideas as to how I can get these nuts removed? I even bought the heavy duty PB bolt and nut remover spray, and no luck.