I have a pair of pressure treated 2X10's about 2' long, screwed together (flat to flat, so they're 3.5" tall by 8.something inches wide by about 24" long), for each side of the front of the mower. Set the mower on this when it's not in use. Mounting is still a matter of getting the tractor as close to square as possible to the mower. Since this is all done in the pole barn with cement floor, I can shut the tractor down & leave it out of gear without it rolling away, yet still move it reasonable easily by pushing/pulling on the rear tires. Only have one anti-sway link also. Sometimes I'll pull the pin on the anti sway link to hook up, sometimes I'll just use a 3'-4' long 2X4 to slide the mower around (the reason for the blocks under the front, it slides much easier on them than it does on concrete, or dirt). An added bonus to my method is that the blocks hold the front of the mower at my cutting height, so the top link can be hooked up & adjusted properly before I ever move the tractor, plus I can set the drop height of the 3PH easily once I start the tractor back up (pull the 3PH control lever back slowly until all slack is out of the lift arms, set the stop, lift & go).
BTW, last time I hooked the mower up, I got really REALLY lucky! Only backed the tractor up twice before I was happy with it's position. Pulled the pin on the anti sway link & the left lift arm fell right on the pin, then the pin went right back in the anti sway link. The other side was slightly harder as I got the lift arm started on the pin, then had to rock the tractor fore & aft a little to get the arm fully on the pin. All told, I don't think it took more than about 3.5 minutes to drop the back hoe, grab the 5' mower, & get to work!