I was very much looking forward to this review, thanks a lot! It confirms our experience with the Belter (we have the urban version, the trail version was not yet available when we bought ours 3 years back). I also swapped the pedals right away for a nylon pair with more grip, as the urban was shipped with slippery alu pedals without any pins.
In the second year I swapped the handlebar to a high riser from woom, which boosted the confidence of the little lady rider, and added alomst another year to the time the bike was used. Now it's waiting for the little brother to grow up.
Other than the changes mentioned, it was flawless. The belt drive is every bit as amazing as you describe it, and the good brakes and low weight are the most important features and justify the price. Resale value in Austria is about 70-80%, based on the prices I see in the used market.
One thing to note: I think it is not easy to mount fenders and a rack, but it should be feasible. We had no urgent need, so i didn't put much thought into that.
Yours looks absolutely amazing, I love the colorful and high quality chromag parts.
The plain silver frame is nice as it accepts any kind of stickers ;)