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The only other thing I could suggest would be to have an electronic copy of your existing config. You might be able to copy/paste line card configs.
It's a little more chancy, especially if your updating the IOS too, but you could try copying your exiting config after you boot into the new sups. From a hardware standpoint, the big plus of the sup720 is the on-board fabric, which was an optional card with the sup2. I.e. final configs might be almost identical. Again, much depends on any IOS version differences.
The sup ports might be the most different between configs.
You might also be able to place a copy of your current system's config on the flash of the new sup(s). (Which let's you copy it when you boot new sups on old chassis before you have other network connectivity configured.)
You might hold inserting the 2nd sup until you get the system up and running on the one sup. Once the one sup is running the chassis, you can insert the 2nd sup, configure redundancy, and once it's hot, just save your config.
