yeah, that stuff will work great! in the time you take deciphering a method to drain the bowls and use the fuel lines to induce your magic formula, wow, your airbox would be out along with the carbs and done right. whats your time worth? whats a piston and/or cylinder worth? i would think there would be days of reading on this site alone, not to mention every other snowmobile related site with people who have tried to do what you are wanting to do. read all about the failures. no shortcut to proper carb cleaning, period, but thats just one persons opinion.
7:51pm-9:09pm? about an hour, you would be way closer to done right in the shop vs over the keyboard. but to answer your question, only way to effectively get it in is through the fuel lines, after draining the bowls. then dont forget to pull the sled over a few times to be sure and draw the cleaner up into all the important parts of the carbs, it wont mystically work of you dont do that part, sitting in the bowls will do nothing for the circuits.
off the soap box. good luck.