There are plenty of clone engines from China using the Helix engine (CN250 motor). If anyone needs help with a Helix or clone, send me a PM to avoid getting this thread off track.
Have you considered mounting this on the back of the FW to avoid the cooling issues and bugs of carrying it up front? If you're worried about pin weight, I'm sure you can locate some heavier items to the forward storage or bedroom if it lightens up too much.
The swivel wheel attachment off the rear of the FW is a sound way to carry your heavier bikes, but the price of these things scared me away more than the compliance of laws on whether they are actual trailers or just cargo baskets.