One way to make the Bible difficult is to try to insert difficult complex theories to Revelation 20.
It is not as mystical as the amillennialist would have you believe, they want to paint it in that light cause their system is very much incapable of explaining away the first resurrection.
Here is the king kong problem: Amillennialists claim the first resurrection is a spiritual resurrection, not a physical one, but the text says "rest of the dead lived not until the 1000 years, this is the first resurrection"
So whatever type the first resurrection was, there will be another similar one a 1000 years later. If it was indeed a spiritual resurrection, then EVERYONE gets a spiritual resurrection, not a bodily one.
Granted, none of this really matters as the literal definition of the word resurrection already kind of refutes any spiritual connotation to it, like being brought from death to life in a spiritual sense. Resurrection MEANS to stand up again, and you guessed it, that happens in the flesh.