Mopeds have been similarly easy to de-limit for decades though and nobody has complained. You crimp an offshooting sidepipe on the exhaust and that's that, proper jobs cut and weld it but crimping works just as well. 16 year olds in the UK are allowed to ride these things on everything except motorways and they go 40-45ish delimited depending on hills etc.

This complaint isn't safety it's absolutely just about opposition to electric.

I know many of those, like the original surron, but they look like motorcycles and scooters, not bicycles. It's not impossible to make normal ebike-looking components go at that speed, but it will severely limit their lifespan or outright destroy them and you're still going to need an expensive large battery to make it work, so I'd be surprised.

There's the Bafang Ultra motor that can be hacked to do that (using a laptop and a special cable and shady exes from forums) but last I checked it will overheat and destroy itself without physically opening it and tweaking the thermals if you push it to those numbers. It's not easy to make a motor that can go at that speed and put out that much power and still fit in a normal bike frame.