I would have thought that would be almost impossible to bolus for. Fruit juice is so full of sugar - it would be like trying to bolus for a full-sugar can of coke. Without the fibre, it would hit your blood stream so quickly, the bolus wouldn't stand much of a chance - unless you could get the timing right you're likely to go high within 10 minutes and then hypo an hour or so later. After all, some of us use very small amounts of fruit juice to treat hypos!
Good luck
Smidge