YM2000 around 1850 lbs. I think 2210 is a heavier tractor, maybe 2300???
I would try mowing first without front weights. You may find the steering too light and imprecise.
'Real' suitcase weights like what were sold for it new are around $1/lb, or less, used. If you're lucky maybe half of that.
It's easy to fabricate something heavy to bolt on to the front bumper. Maybe go to a junkyard for a truck flywheel, or build a box you can pour 2-3 sacks of premix concrete into. One caution, don't build a wide bumper that will interfere with the very short turning radius these are capable of. And the heaviest part should be as far in front of the tractor as possible. You'll never notice if your
ballast makes the tractor a little longer, but any additional width that interferes with turning radius will forever be a PIA if you have to work in tight spaces.
I see you already list a couple of tractors. Are any suitable for this mowing?