General - Modifying Dice

On Page 14 of the rules it states that when a die has been rerolled it cannot be rerolled again during the attack unless an effect states that it can. If I have a card that allows rerolls and a card that allows a die to be set to a specific value, and I also get a target lock; can I only perform 2 of the three and in order in this example?
1. Roll my dice for the initial action
2. Perform the set action as I have not yet rerolled any of the dice
3. Perform the reroll action from the card
Do I now have to ignore the unused target lock and use it in a later round or can I use it to modify any existing dice that may enhance the outcome in my favor? While I expect that the above order is the only order in which the dice can be modified it would be nice to have this outlined in the FAQ for future reference.
1. Roll my dice for the initial action
2. Perform the set action as I have not yet rerolled any of the dice
3. Perform the reroll action from the card
Do I now have to ignore the unused target lock and use it in a later round or can I use it to modify any existing dice that may enhance the outcome in my favor? While I expect that the above order is the only order in which the dice can be modified it would be nice to have this outlined in the FAQ for future reference.