It seems your biggest problem is the lack of ground clearance of the front axle. Lift it up and toss some poles or whatever fill you have, under the front wheels and use your neighbor's little tractor to pull the boxblade away from behind the tractor after you disattached it.
Then pinch the bucket forks into the ground and curl it back untill the oil starts to whistle through the relief valve. then gently drive backwards in a slow gear while keeping full pressure on the bucket movement, and your neighbors little tractor adding some pull with a long rope from a dry spot. Just avoid any wheelspin because when there's no firm subsoil up to axle depth, even spinning mud slicks will cause the earth to move in all directions, bogging you down more.
Once i had my Zetor 5245 on its belly in pig ****... I used a double chain link and had our 2wd 6718 in crawl gear, pull from firm ground. Since i was alone this evening, i had to put the tractor in lowest gear idle and then hop onto the stuck tractor. The helper just started to dig when i put the stuck 5245 in gear, hopped a foot forward and started to bog doen again. I waited a few seconds for the chain to strain, and again drove forward and had it loose... Both tractors were about equal in weight and it was just peanuts. /forums/images/graemlins/ooo.gif