Hey Alan,
if you have banged in the bridge post bushes all the way they will be hard to remove. They are tapered and you won't need glue. Here's a cool method to remove the bush without damaging the finish and damaging the bridge post. Note I'm pretty sure its the treble side tailpiece bush that has the hole for the earth wire to the cavity, have a look where the hole is in the control cavity and line up which post bush you have to remove.
https://www.youtube.com/watch?v=Q1ppKxEIF1M
when you put the bush back in, make sure the earth wire has plenty of bare wire making contact with the bush and tap it back in place. Do not use glue, trust me they aren't going to come out.
Sure you can intonate the guitar with the plastic nut, you may have to intonate it again with the bone nut when it arrives as a difference in the height of the string slot will affect intonation.
With a new neck and new strings the neck needs to be played in a bit before it will hold tune. A good exercise is to stretch the strings once you have wound them on the tuner posts.
Best of luck, hope you can get it playing soon !