The new FAQ specifically states that "Juke can be used to modify the [evade] result added by C-3PO"
Seems straightforward enough, but wait, the text for 3PO doesn't say anything about adding the result before the defender's turn during the Modify Defense Dice step (just that you have to roll the number of [evade] results that you guessed before modifying them), which happens after the attacker's turn, so how is this possible?
Current text: "Once per round, before you roll 1 or more defense dice, you may guess aloud a number of [evade] results. If you roll that many [evade] results (before modifying dice), add 1 [evade] result."
Based on this new FAQ, it seems that the intent is to add the result immediately, which opens up the result to modification from other abilities as well (e.g. Zuckuss, R4-B11).
If this is the intent, shouldn't FFG errata 3PO to read something like: "Once per round, before you roll 1 or more defense dice, you may guess aloud a number of [evade] results. If you roll that many [evade] results (before modifying dice), immediately add 1 [evade] result."