Hi, thanks for looking out for them. It's difficult to say without actually seeing where they are but I too was wondering, like Wolfwood if there was a way you could at least disguise the nest so it isn't quite so obvious. Maybe with some cardboard or something. There's always the risk that may in fact make it more obvious if someone comes along clearing rubbish. A difficult one to call.
If you move it they will probably abandon it anyway, so if there is a way of letting them stay, then hopefully things will sort out naturally.
I think what you suggested may be best to start, and just keep an eye on them as they are for now and if they hatch and things seem ok, then leave be for as long as you see fit as the longer the babies are with the parents, the better chance they have. Trying to raise them when they are very young will be very hit and miss for them anyway, so that's a last resort.
If it comes to that do keep in touch so we can help as much as possible, or see if there is anywhere near you that can take them, but places that do are a rarity.
Sorry I'm not much help, but do let us know how things are going.
Janet