It seemed as though the western version of Taiko no Tatsujin: Drum ‘n’ Fun would only be available through the Nintendo Switch eShop. This is a shame for those who were hoping of adding a physical copy to their growing collection. However, Amazon UK has recently put up a listing for a physical version of Taiko no Tatsujin: Drum ‘n’ Fun. This has yet to be announced by Nintendo UK or Nintendo Europe.
Amazon UK Lists Taiko No Tatsujin: Drum ‘n’ Fun Nintendo Switch Physical Release

Some shit if this ends up being like Rhythm Heaven Megamix where it was digital only in North America but a physical release in Europe.
I knew this would happen but least the switch is region free? so even if this is true Why are you worried?
Fingers crossed. I’ll import.