There is a Very good probability that you can true the wheel with the 2 missing spokes remaining unfixedIts because of where the spokes have snapped i will have to remove the tyre, inner tube and tape because i can't get the remains of the spokes out of the nipples.
And probably the disc as well.
Its not a black art at all
just search for wheel trueing on utube for more in-depth vids but the above covers most of it in less than 5 mins..