Id say yes, but pedio will be doing all the heavy lifting. Then the bret will have some cleaning up to do. So you're looking at a few months for this beer to be all done. That should be expected though.
So, you're going to just pull a gallon of your saison and play around with it, right? If so, I think I would just purge the secondary with CO2, rack my beer onto the fruit, pitch the roselare straight from the pack. Airlock till it quits then bung it and let it ride for several months.