had a Bush Hog 6' hd 3ph rotary cutter on my previous MX5000. yes, would work fine. main thing is keeping the knives sharp, so impact wrench, etc, a must.
it should do your mowing description just fine. expect to spend considerable time through the mowing season to keep the field in good shape.
but if you are looking for a suitable utility tractor to tackle overall chores of your acreage, i would defer to my earlier post : get an M series line.
get a size that will handle your growing future needs as well.
but you could get by with what you described. if you go with the MX series, spend the savings on a good HD 6' 3ph rotary mower. load your rear tires. Rhino is my personal choice, lots out there. or, if you must, look into different drag types of larger sizes.
sounds is as if you are back at the starting point again of your original post.
all i can say once you work an M series, you'll never want to go back..... good luck