Here it is at only £231 inc shipping. As well as a cassette motor, the KT controller is 17A, so at 48v, it'll give all the hill-climbing you want. Best of all, it has the block connectors for easy testing. One of the pictures in the description shows a torque arm and the packing list says, "zip ties and protection line". I'm wondering if the protection line is a torque arm.
If you click on the seller, they have loads of other stuff too. They're located in Kunteng, so the KT controller factory must be next door.
www.aliexpress.com
If you click on the seller, they have loads of other stuff too. They're located in Kunteng, so the KT controller factory must be next door.

36/48V 250W Electric Bike Conversion Kit Brushless Rear Cassette Gear Hub Motor Wheel With TFO1U Color display for EBIKE - AliExpress 18
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