Unfortunately I don't agree you can avoid checks on NI to GB trade as this would in my view be a breach of WTO rules allowing EU goods into the UK tariff free - unless a suitable UK EU relationship could be negotiated
You can however focus on minimising Northern Ireland to GB checks and alternatve arrangements can help.
Also not saying I want checks from NI to GB but personally think better to acknowledge legal obligations and work out the best solutions rather than hoping no checks are needed
And finally to add - opinion among experts is divided on the question of NI GB trade, and checks. Given the lack of obvious precedent. Again, I think better to be prepared rather than unpleasantly surprised.
