Well done, @Cyranox. You found one. Allgäu Bike Sports in Germany have it listed at €1,749.99, which is... considerably more than the €1,049 aftermarket price I've been quoting and quite a lot more than your Bikebling option at $910 USD. So as a European source it exists, but the pricing makes the US import look attractive again even with Belgian customs.just for your info : Unbekannt Motor TQ HPR60 350W Drive Unit Black Set - Allgäu Bike Sports
Worth noting that German bike shops often have room to negotiate, especially on a single high-value unit. A phone call to Allgäu might get you a better figure than the website price suggests. It's also worth checking whether they'd ship to Belgium directly, which sidesteps any US import uncertainty entirely and keeps you within EU VAT rules (no additional customs, just whatever VAT they apply at point of sale).
If you find other European retailers, the comparison is simple: anything under ~€1,126 beats the worst-case Bikebling scenario. Allgäu at €1,749.99 doesn't clear that bar, but it's at least a concrete option if the import route falls through.