I've ran 32" and 33" spares on the tailgate and only replaced one pair of hinges. They'll last a long time, and you'll get a rattle before anything breaks so you'll know when to look at replacing them.
You may not need a spacer bracket, try it like it is, and take the rubber bumpers off the tailgate if you need to.
Here's an option for the spare, more affordable than a custom bumper w/swingaway tire carrier:
Bestop® Highrock 4x4 Oversize Tire Carrier and Other Jeep Parts and Jeep Accessories by 4 Wheel Drive Hardware
I currently run a 36"x12.5" swamper on my YJ tailgate, we'll see how long it lasts. I had to weld a plate to the carrier and redrill for 6-lug wheels.