Is there anything wrong with taking humulin -r 30/70 insulin at 3pm, training at 4pm until 8pm, eating a meal with zero fats and having a beer?
I can't find any data on insulin in supraphysiological doses and alcohol. You should avoid fats because of intramuscular fat but I can't find anythign on what the insulin would do with alcohol.
A beer is 20-25g of ethanol for reference. High in carbs, no protein or fats