If you take Turbolaser Reroute Circuits on a CR90(A) should you be able to use an evade token to trigger the ability for each of the two attacks that the ship can make (since it has two evade tokens)?

You can indeed.

In fact you could spend the token for the front attack then for the second attack get rid of the exhausted token.

And then use Walter Blissex to get it back again?

That you can do.