You should try it. I predict you will be very surprised.
Not only am I able to complete a power lifting regimen (1.5 hours, squats, deadlifts, basic stuff) in a 16+ hour fasted state but I sometimes find myself having more energy to do the lifts than in a non-fasted state.[1]
In two years I have never needed to stop short a resistance workout due to lack of energy (or whatever I used to worry about before I tried it).
Yes, you will need to more carefully budget those 4500 calories over the non-fasted blocks of time - you'll still need those calorie inputs. I suggest nut butters and avocados but whatever works ...
YMMV.[2]
[1] This is also true for my aerobic running workouts, but to be fair, I cannot do my full blown wrestling workout (60 mins of training followed by 4-6 5min rounds) in a fasted state.
[2] Something I found very surprising as I aged into my forties is that I used to think my exercise regimen(s) were the significant factor in my metabolism and calorie usage. In reality, if you add up how many calories you use lifting weights for 1.5 hours or running 5 miles, etc., it's quite modest ... the major contributor to my very high metabolic rate was just background metabolism. I mention this anecdotally because if you have difficulty without meals it's instructive to really consider how much of that is due to the workouts (which burn a (relatively) small amount of calories) vs. your actual background metabolism. It also suggests that if you have a negative response to IF now, it's worth trying again in five years as your background rate will naturally drop - even if you maintain the same (or higher) athletic output.