A few minutes in a home oven even at 450 degrees can't do much to the steel if it was an hour or close yah
Saw bearings coke up all the time and he said that when he re oiled they seem fine
Unless I am reading your post incorrectly it appears that you are suggesting replacing the steel balls in the metal races that you think may have had their hardness spec compromised?
Well I work with a tool maker. He is a machinist who sets up lots of different things that need bearings. Further, I worked at the local Roller hockey/ skateboard shop as a kid with same guy. from day one we always tried to save by finding "houses" that sell bearings to company's who produce things. Obviously Stihl is not making bearings, they have what I would guess are German bearings (some of the best) and they are sourced from some maker. When you buy a bearing in Xsize from a distributer, you are paying far less then when your refrigerator fan dies in your house and you need to purchase same said bearing as Maytag part #XXXXX.
Many times when we have been stuck, I have pulled a dirty or used bearing, Removed the seal from one side, removed the cage and balls, cleaned and relubed and then installed that bearing with the open side facing in, still leaving an effective shield. I am not familiar with the saw's bearings. Most bearings that are engine applicable are needle/rollers/pins etc.. If the saw's bearings look like a reg roller bearings, yes you can clean them and reuse them provided that the heat did not damage the hardness of the bearing, and that the cages are made of metal. Look here
Note how these have a dust shield the guy is removing.
Now notice that the shiny chrome is not in fact the bearings but a form fitting cage that keeps the balls separated. This cage is sometimes plastic and would be damaged by excessive heat. If it is in fact metal, it would need to be carefully lifted and removed to get access to the balls in the bearing. Once your cage is removed, you can soak the bearings in kerosene, or any solvent in hopes of removing any burnt oil, dirt etc.. Then you reverse the process and get yourself a nice cheap arbor press.(you guys like the name already)
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. Between foreign cars, tools and toys, I have pressed on my share of bearings. IMO, there is more risk In heating a bearing then not. Heat the seat, leave the bearing at room temp, have the right size race to press and poof! they go on/in