You're taking a gamble with marine 2-stroke oil. I mean, a little bit isn't gonna hurt the engine, but keep in mind that marine oil is designed for water-cooled engines, which even at sustained full-throttle operation get nowhere near as hot as an air-cooled Blaster. Consequently, marine oils do not need to have as many anti-scuff (and other) additives since they aren't exposed to the same high temps. Plus, remember that the average outboard motor seldom runs over 5,000 RPM at full throttle. A blaster can hit 9K easy. Marine oil won't provide the same hi-temp and high RPM protection in your air-cooled Blaster as a good quality, motorcycle-grade 2-stroke oil such as Bel-Ray or Klotz.
I don't think you'll blow your engine by using outboard oil in it, but I wouldn't do it to my Blasty. I'd rather spend a little more on oil and a little less on having to replace a worn-out top end that was damaged, just 'cause I was trying to burn off a couple gallons of waste fuel. Lol.