Andrew, you should also have mentioned that those forks all have 20mm "Thru-Axle" fixings which are not suitable for use with front mounted hubmotors
or the old style front wheels/hubs.
They would therefore require a new front wheel assembly
(or new hub and a wheel rebuild) to enable them to be used, which may not end up being very budget friendly.
For the price of those forks I would expect a complete bike
(or even two or three bikes), but then again, I'm just a cheapskate with a non existent budget.
Alan