Might work for a while. But those complicated trade deals break down into an awful lot of issues that people do care about, and the experience from around the world is that you can't keep them hidden from sight.
Also - the EU, US and other trade partners have domestic processes that mean they will be talking in public about trade deals with the UK, and the impact for their business. And this interweb will quickly transmit any interesting messages...
Worth remembering also that as things currently stand customs checks on trade between Britain and Northern Ireland start on January 1 2021. As they will for Britain to EU trade. These are going to be hard to hide.
