If you´re willing to rebuild your wheel (assuming 32-hole but Benner do have 36-hole hubs as well) you could get these bits for about 70 quid delivered:
https://www.bikesportparts.de/zubehoer/beleuchtung/2258/busch-mueller-lumotec-iq-avy-6v-dc-led-frontlicht-stvzo-ohne-halter?c=48
https://www.bikesportparts.de/bereifung/naben-und-schnellspanner/2188/sram-d7-nabendynamo-i-light-32-loch-6v-3w
https://www.rosebikes.de/herrmans-h-trace-dynamo-rucklicht-fur-gepacktrager-2666683
https://www.rosebikes.de/dt-swiss-champion-speiche-47697 (x2 for 40 spokes)
https://www.rosebikes.de/b-m-lampenhalter-333269
@Petteri started
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If you´re willing to rebuild your wheel (assuming 32-hole but Benner do have 36-hole hubs as well) you could get these bits for about 70 quid delivered:
https://www.bikesportparts.de/zubehoer/beleuchtung/2258/busch-mueller-lumotec-iq-avy-6v-dc-led-frontlicht-stvzo-ohne-halter?c=48
https://www.bikesportparts.de/bereifung/naben-und-schnellspanner/2188/sram-d7-nabendynamo-i-light-32-loch-6v-3w
https://www.rosebikes.de/herrmans-h-trace-dynamo-rucklicht-fur-gepacktrager-2666683
https://www.rosebikes.de/dt-swiss-champion-speiche-47697 (x2 for 40 spokes)
https://www.rosebikes.de/b-m-lampenhalter-333269