DK,
I do not like applying heat to metal, especially parts like the crankshaft, or axels. I realize that sometimes this is necessary, but IMHO only as a last resort.
What would the heat do to your front crank seal?
Here is a thought worth trying before you try a torch, propane or otherwise.
Boil a couple of quarts of water. Wrap a cold wet towel around the crank near the front seal. Pour (slowly) the boiling water over the crank and key, then immediately apply an ice cube to the key for about 30 to 60 seconds. Then try to remove the key.
If this does not work you can apply heat from, say a propane torch. Again I would try to protect the seal with a cold wet towel. Once the crank is hot I would again apply ice to the key.
The idea is to expand the crank metal with heat, and contract the key with cold. At least that is the theary.
Once the key is out, I would plan on replacing the seal if you have to use a torch. For what a seal cost do you really want to have to pull it all apart again? Food for thought.
Hang in there DK, your making progress. rangerj