I personally candle my eggs every day, I'm not sure why thinking twice a week would be too much? Especially if you don't yet know if they are fertile. You want the hen to be used to you getting at the eggs, as you will also need to check babies at least once a day in detail, weigh them and examine them, etc.
Well, I love candling and you candle yours and some breeders don't candle at all. I've talked with a couple of others and they don't even check until after the birds have hatched. I CAN'T WAIT THAT LONG....IT'S LIKE CHRISTMAS FOR ME.

I do look in the box - especially with the ekkie because she lets me. With the macaws I'm more careful.
Be careful with artificial calcium especially with eckies... I'm assuming you know that they can suffer greatly from too much of anything in their system, as they are unable to pass the excess artificial.
Yep - I know.
Dropping eggs off the perch is a lot more likely to get her to stop laying, assuming you are also taking all the other appropriate steps to control her hormones, than giving her a box or any other nesting encouragers. Separating macaws can be quite hard on them and should be a last resort.
I highly suggest removing the nest boxes entirely until you are well settled in your new home. The disruption of moving is not healthy for a nesting bird, and can cause them to abandon their eggs, a tragedy for you if they are fertile. It can also cause confusion for young birds still learning e natural nesting cycle which you really want to avoide. In addition, if the eggs were to be fertile, you wouldn't have the time or attention to devote to the babies in that case, as chicks require a lot more attention than simply removing boxes, especially if something goes wrong, and especially if it goes wrong right away.
Yep - we all agree on this and I had removed the box but I didn't remove it soon enough.
I do have people on standby (with the appropriate incubators, brooders, and staff) if needed. They can take over at any moment for me BUT we are hoping it doesn't come to that.
You implied that you chose the eckies because you had a layer. Parrots should not be laying eggs without mates; if they do, something is off kilter with them. That should be corrected before they are bred.