The battens were probably designed in to prevent flutter, you can likely remove the battens from the pockets in order to be able to furl the sail.
If the sail flutters too badly you may need to add a vertical batten (that's what I have in my jib, the back edge has 1/8" fiberglass kite rod sewn into the trailing edge, this wraps around the mast easily when furling, and helps keep the sail from luffing. ( I believe vertical battens are optional on Nacra jibs, when people have a furler).
Actually my wing jib has 17 full length horizontal soft battens that I constructed from an old steel tape measure (the type with a curved tape), they are typically called soft battens. I cut the battens then covered with mylar packing tape to make them waterproof, then just slid them into the pockets. They furl around the mast with no difficulty, yet they keep the sail from luffing. I designed my jib to remain stable in winds over 30mph so there are a lot of battens and re-enforcements in it. In very rough conditions (high winds) I furl the main completely and only sail with the jib alone.
I would initially just take the battens out for now and see how it works, when trying it out if you post some video most of us can tell you what needs to be added or adjusted to make it work.
Supporting the leading edge with a mast will of course help (can be PVC tubing). You will also need a rear stay line because this jib was designed for use on a much more rigid (stayed) mast. Also your clew line will need to pull almost downward (tied in probably in front of the main mast) similar to how it works on your cat. It would be cool if you could rig it to be self tacking.
Because the sail is so large you may need to mount the jib further forward on the bow sprit than where I have mine.
In higher winds (>12mph) you will likely need to furl the jib some or it can bury the AMA and tip the TI over on a reach with both mainsail and jib open full out. My original (non-wing) jib started at around 40 sq ft, and that was a little large, I eventually cut it back to around 30 sq ft and it was fine but I did have to furl it in some in higher winds. If those sails in the picture are standard Nacra 500 jibs, I believe they are around 40 sq ft.
That jib is so large it will likely work like a big genoa in lower winds, and downwind you will be able to set the jib to one side and the main to the other in a batwing setup, so you may not even need a spinnaker (downwind performance will be awesome).
You will find once you add the jib you will be able to point much closer to the wind when on an upwind.
You know what they say once you go over to a jib you never want to go back
Hope this helps