Half acre: Big box store 48-52" ZT would serve you well. Suck it up and get used to your direct PTO....assume you are talking about a "tranny" PTO like is on my 2400 If you really have Live PTO, it may be via a double clutch like the old Ford tractors, or may be an electric live which interrupts the drive when you push in the clutch, otherwise it's also tranny driven. The thing about my 2400 is that as you let the clutch out, the PTO starts turning before the tractor starts moving. I suppose if I paid that much attention, I could diddle the clutch and make a Live out of it, similar to how the Ford operates.
On a MMM, I thought many times about that and the answer is no for 2 reasons: Mowers get clogged. Cleaning out a MMM vs a conventional or ZT is a PIA.....however, if you hoe isn't in the way, you might use your FEL bucket to lift the front tires off the ground giving you room to access the deck without removal. Then there is the extra weight, followed by the fact that every time you enter the tractor, you have to step over it. The $2500 you would pay for it (Branson brand) would pay for that BB ZT.
The ZT is super fast mowing vs the tractor. I have the tractors posted and 3 ZTs and 3 conventional mowers from 48 to 61" decks. By far the cut is better with the ZT vs the tractor, the ZT doesn't make ruts in the yard, the ZT is much faster in areas where a lot of turning is required and can do a 90* corner where a tractor can't. Efficiency on todays 4 stroke, carbed mowers, and speed as mentioned, makes it your cheapest operating machine and the fuel is cheaper than diesel. Under deck operations are easily accomplished with a HF $88 3 ton floor jack.....3 ton for the height of lift.