1. How the hell do you know its going to be blown off before liftoff?
2. Is it going to do so symmetrically?
3. How big is the increased drag until its blown off?
4. Does this affect your ASD/TOD?
5. What is below the dry snow?
6. The wing has different temperatures due to fuel, sun, wind etc. So does the snow. How does this effect?
If you want to become a testpilot, do so. Flying commercial is not a place to operate at the very end of the envelope.
By all respect, in airline biz there is no room for speculations, no dry-snow-will-blow-off-during-TO procedures and no room for morons who think so.
With that attitude, knowledge and adherence to procedures you are demonstrating here i dont give you any change to survive in any airline. If i am wrong just give me the 2 lettercode so i can avoid it.