You're right. The studs are like cheese... You can try getting them nice and hot first and having a go.
Personally, I'd remove the pipes and ditch them. Get some stainless ones from Motad if you're planning on keeping the bike long term. If not, just leave them on and wait for them to rot. They will probably last a lot longer than you think unless they are seriously pitted.
If you do get the bolts out, get some new bolts (HEX head) and put them in with plenty of copper grease.
Painting header pipes is usually a waste of time. It takes LOADS AND LOADS of preparation to get the rust off and you will spend about £20 in high temp paint which will only wear off in a couple of years with the weather.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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