Stuck front rotors: to heat or not to heat?

[BodhiBenz1987]

I'm replacing all four rotors on my dad's S320 as his are a bit warped after sitting for 10 years. Unfortunately even on this nearly rust-free specimen, the rotors are rusted stuck. Have done quite a bit of slamming with the sledge, and use of AeroKroil. I've noticed this issue has come up in searches a lot, but I see differing advice on use of a torch. When my w124's rear rotors where stuck on, a torch got them off immediately ... however, I knew I would be replacing the rotors and the bearings. On this W140 the rotors are getting replaced but not the bearings ... will I damage the bearings or overheat the grease if I lightly torch around the top of the rotor "hat"? Some people say they use a torch; others say don't. Thoughts?