The fact that you're suggesting insurance and registration are to be expected for any class of vehicle short of a moped is completely foreign to me.
Being hit by a moped could easily cause life changing injuries, so I'm pleased to see them insured.
There is already voluntary insurance for (e) cycling here. Making it mandatory for some makes no sense.
Ebike is not a moped. Mopeds can go much faster than the proposed limit of 25mph.
Mandatory insurance is a band aid.
If everyone was required to insure stuffed animals it would be cheap and perfectly "manageable" because the risk would be so low and the overhead would be spread over society but that overhead would still be pissed away on something non-productive because the net benefit to society of insuring stuffed animals is so small.