Why would you use a platform like Amazon for high value, high complexity, low volume sales like this? Amazon is for a bunch of sellers competing on the same product used, or for highly similar products like "USB hub" or "guitar picks."

For one, I wouldn't sell it without cash in hand/wire/ACH or something that's chargeback/dispute proof, and for two, I'd use Shopify or something like that only shows your brand and allows you to have the appropriate info re: shipping, delivery time, etc. (or again, if you are one product that costs a hundred grand, you can afford to throw together a custom order UI and add Stripe for payments).