I love your ideas to surpass import taxes to lower the prices. But, as Ludo already said, that ain't going to work. If it did, we in the EU would have been flooded with, for example, US-made products in the last 20 years. Instead, we have been seeing a flood of Asian-made products. Why? Because their products are cheaper to produce (lower costs of labour, lower costs of housing & utilities), thus cost less, which in turn means that import taxes and VAT are lower. The only other thing that could work, is producing locally, thus cirumpassing the import taxes. However, even in Europe most of the production is nowadays centered towards the Eastern EU countries due to lower labour, housing and utilities costs (for example, most of our cars are nowadays build in countries like Hungary and Slovakia, heck even TLC nowadays has their main factories in Hungary and Czech Republic...). Or production in China. However, that means that you will lose your direct influence on the quality, since for any quality control you will be dependent on Skype, samples send to you, or actually flying to the production locations. Even TLC themselves haven't solved this issue properly, as far as I recall the special pieces made in China for the Collectable Minifig Line still are to some degree inferior to the Billund-produced legos. Potentially, he could set up an import-export firm for Europe which imports the tracks for production costs, then selling them in Europe for profits, but this creates some very messy stuff which more looks like how multinationals work then a one-man-shop from a guy with some awesome ideas and great engineering skills.
Conclusion: Only when Coaster is willing to relocate prodution (or starting a franchise with copies of the molds, but this means some EU citizen will need to invest in getting identical molds made), which I highly doubt he will be wanting to do (and which I can fully understand, see above), or when he is going to become a multinational like TLC themselves, we EU citizens will have to accept that we need to pay some extra taxes.
The only options I see in the short run: Sending the tracks to a EU country with lower VAT and/or import taxes (even though we are an union, all our countries have our own VAT and import tax tarifs) and then transferring within the internal market without extra taxes (long live the internal market of the EU!) or just going on holidays to the US and buying your tracks locally.
(Then again, I'm neither a production specialist, nor do I have any experience in these commercial schemes, so please all take them with a pinch of salt ;))