"The 4410 is really about the same size/HP ratio as a 3520. Are you sure about 96"??? Seems pretty big."
The 4410 produced 34.6 Gross HP and 30 HP at the PTO. The 3PH capacity is 2200 lbs 24" aft of the mounting eyes.
A 90" Befco or Land Pride requires 30 and 25 HP minimum (respectively). The Befco weighs about 1100 lb, the Land Pride weighs 1025 lb.
So yes, the 4410 could handle that larger mower. As you may notice, both mowers I've described actually cut a 90" swath. If the grass (remember, these are grooming mowers...not for field use) is wet or more then 6" or if the tractor bogs, one can always cut a partial width pass.
My 790 runs a 60" Befco RFM. It handles it so easily, I'm sure I could go for a 72" unit with little trouble. That's with 24 PTO HP.