that's a lot of honey, and to be honest the only way to see if it works is to try it,...but bread yeast does not have a high alcohol tolerance so more than likely you will get to about 12 or 13% ABV and then it will die, leaving you with a sweet mead. If you want really high ABV i would go for a wine yeast with high tolerance, ferment dry, stabilise then back sweeten if necessary. the starting SG may also be a bit high for bread yeast anyway, although I have used 3.5 pounds of honey in a JAOM and it started fine (slowly though, and fermentation was slow and steady, never foamy or ebullient)
good luck!