Yes, the flat underside of the muffler mount bracket works good. It’s like it was designed as a jack location. Secure the handlebar/front forks with something because when you lift the rear the weight balance will shift to the front and the handlebar/forks will need to be steady — especially when you bust that axle nut/bolt free and reinstalling. You don’t want to throw the bike on the ground when you’re torque-ing around back there.
Note: You will curse the little screw holding the lower and upper belt guards together. Be prepared to drop a few F-bombs! You have to be able to rotate the upper belt guard forward and out of the way. And if you have the stock license plate bracket and license plate on it, remove the license plate (you can leave the bracket on). You’ll want every available inch possible when removing the wheel from the swing arm. If you don’t remove it first, you’ll see what I mean when you get there!

Take pictures as you go to help remember exactly where things are… like belt tension marks, brake adjustment position, and left/right axle spacers. You’ll want to check your belt and brake adjustment positions while you’re down there, but at least you’ll know where they were set before you tore it down (good starting point for reassembly).
Ye good ole Dunlop D404s. I liked those on a previous S40 I had. In fact, they’re what I just replaced with the Shinkos on my current bike. I don’t know what kind of miles they had on ‘em, but they weren’t dry rotted after 8 years and still had good tread.