Sorry that wasn't meant to be a criticism of the factories, I meant it as a statement about manufacturing generally. We've shipped a lot of the "dirty" stuff out of Europe to the Far East, and what we have left here is in the most cases assembly lines. (I know this is a generalisation)
This measure by the EU, can be discussed in a host of ways and I'm not really sure if I'm for or against it personally, I'm just used to it because its effected bikes for as long as I've worked in the industry. So to be honest as eBikes grew and the "bike" brands got involved I saw this as being pretty inevitable.
However the end result is that you'll simply need to do what the bike brands already do, which is source the components / frames from the best factories in the world and then turn it into a bike inside the EU. This way you minimise your tariff liability, and maximise the amount of labour costs that are paid within the EU.
I don't really see what the problem is? You'll only be moving the labour bit, and it'll reduce lots of other head aches won't it?