Wake up USA, there is nothing political about tariffs and shipping, many other countries have them around the world you are not the first to go down this path and the same HTS codes used are not an issue for Europe, Switzerland, India, Japan, NZ, Australia, Canada and many others - just the USA. Maybe one day when the border handling systems, software and suitably trained border staff are in place in the USA all will be well.
Some seem to think that the USA is the first country on the planet to do this, far from it, they are most probably the last and currently making a right mess of it with ever changing goal posts and interpretation of what they need to do. We use the same major couriers to ship globally and they have no problems with no other country other than the USA.
It may also surprise some that 80% of our business it outside the UK, we are well aware of global shipping policy country to country, in fact, what the USA is asking us to do is not even complicated for us, Australia is more complicated as they have the sales tax layer added in as well as tariffs that we have to collect from the customer and pay to the Australian tax office and guess what, that works smoothly. The issue that the USA is currently problematic seems to be the border staff and systems they use were so ill prepared for it.