I'm not sure you read my post.This I have found is the best quickest and easiest way of taking the the bolts out.See below and my post above.
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What I do is to get the two nuts on the thread tighten them together by turning them the opposite way to each other,then I have a spanner on the bottom nut and undo the stud.If you take the studs off you will be able to get the crankcase apart.I'm guessing you'll see more problems in trying to get the piston out.I feel that trying is only taking up time for you to see that there will be nothing savable.Cylinders,pistons and cranks really aren't that hard to find.
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Here for a good time,not a long time.