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@Smallfurry
Basically you want a 56 tooth chainring, and a 20 tooth sprocket to get that high. I think 20 is the smallest sprocket as the belt dosent bend as well as a chain. Also, I think they only do a 55. So thats more like 67GI. This gives you a long CS length of 410.7 though.
To get a 390.3mm CS length 60:22 works, and gives 63.4 GI, with the option of getting a 20t sprocket to run 73.4GI (CS of 395.3mm). This is using a 113t belt.
So it depends on how flexible you want to be with your chain stays. Long ones are nice if you are looking to run a rear rack. But if not, I'd be tempted to keep the stays short, and run option 2.