If you can’t get the Hakone maybe you should get a regular 86 or BRZ and mod it the way you want. Looking at your post it sounds like you’re not 100% on the tS anyway? Why pay extra and then swap out parts or wrap the car a different colour etc. better off buying the cheaper version and carefully select the parts you want. Unless I’m wrong and the tS has everything you want?
I hope it works out and you get the Hakone