It sounds to me that you really don't need an ebike at all if you can pedal at the speed you claim but I'm sure you know what you're doing.I just don't see the point about having an electric bike limited to 25km/h. I'm perfectly healthy and I'm fine with peddling at 20-25km/h. What I need is a vehicle fast enough and practical to carry.
To my knowledge, in the UK there is no e-bike light or fast enough. At least if I buy from this dealer the bike runs faster, can roll once folded and has 2 years warranty on the bike AND the battery. No dealer in the UK can provide that. (if so, just let me know)
I just cross my finger and hope the seller is not exagerating what he told me: Up to 40km/h (but I would largely accomodate 35km/h) and ability to roll once folded. (will make videos review)
If you don't see or can't see the point of ebikes being limited to 25kph, you obviously haven't researched the matter fully as there's plenty of material explaining exactly that on these pages.
Presumably, you have considered the potential resale value of your bike should you wish to divest yourself of it if it fails to live up to your expectations? Certainly, those British-sourced ebikes you have chosen to ignore would have a resale value as there's a lot of respect for most of the usual suspects, mentioned frequently in this forum.
All in all, I'm not sure why you want an ebike but if it's so you're able to achieve 40kph, then that's achievable, (for some) on a regular bike or, (for anybody) on pretty well any small moped.
Can you explain what it is you seek to achieve in a budget-priced ebike?
Indalo