Can I use Kanan's ability, resolve his die and use impulsive and resolve Kanan's other die then resolve impulsive?

This is the sequence:

Use Kanan's before trigger and resolve one of his die.

Resolve a die from Impulsive and gain an ambush action.

Use Kanan's before trigger on the ambush action and resolve one of his die

Use the ambush action.

What you cannot do is resolve both of his dice, then choose a die to resolve with Impulsive.