I don't have any experience with cold sprays or induction. I'm curious about them though and would try them, given the opportunity.
Most of my research seems to indicate that a mixture of 50/50 acetone and auto transmission fluid is a very good penetrating oil. There is also a spray called Aerokroil which is fairly expensive but seems to be known as the best retail spray there is. Hard to find but it's on Amazon. I bought some this year while doing a full front and rear chassis refurbishment and VOD project and so far I've been very happy with it. It was recommended to me by a mobile truck repair technician.
https://www.amazon.com/Kano-Aerokroi...dp/B000F09CEA/
I've also used MAP with a Bernzomatic TS8000 swirling burner and that works pretty well too. Acetylene is apparently "the best" but not easy for a Sunday shadetree guy to get a hold of in a pinch. Many hundreds of dollars in equipment just to get set up for something you will rarely use.
So, for the regular guy wrenching, my suggestion is an oil can with 50/50 acetone + ATF, a can of Aerokroil, and a good quality MAP torch. But for real, patience is the main thing you need. Recognize which bolts are likely to be a problem and soak them for a couple days first. Spray them twice a day until GO TIME. Strike the bolt head squarely with a hammer every now and then to loosen them up. Hit the surrounding metal (NOT the bolt head) with some heat, and then try to turn them out. Best to use a 6-point socket and turn the bolt hard the first time. If you try to go slow, it's more likely to twist the metal so it breaks. Give it a good firm turn so it shocks loose. If it's still feeling tight, spray more penetrating oil and wait. Then turn it out maybe one full turn, then back in half a turn, and go back and forth between those two points with the ratchet until it's moving freely. Then go another half turn or full turn past that point. Stop, and turn it back into the hole, back and forth until it's loose. And keep coming out like that. Just a bit further each time.
Get the bolt out, blow the hole out with compressed air, and replace the bolt if it's at all rusty or suspect. Oil the new bolt with cutting and tapping oil and run it in a couple times to make sure the threads are good and lubricated. That way you don't make things worse and you'll be less likely the crossthead when re-installing.
If the threads are open on the other side, like for example the holes that you screw the sway bar into the front frame extension, spray both sides of the bolt. And that would be very easy to chase the threads out with a quality thread tap before re-installing. There is a special tap for blind threaded holes but I don't own any of those.