I have a little mini blow torch that I use to make crème-brûlée. Perfect for sterilizing tools, just have to press a button to get the flame.
You don't need to get the blade dull or red to sterilize. In the labs at work we hold our tools barely a few seconds over the flame, and it's more than enough to sterilize them.
this is what I have , and the small size of the flame makes it very easy to handle while lit.