My SAR group (Search and Rescue) have two Zodiacs that we use as tenders and for training our newbies.

They are a few years old now and have had many many many patches on them. Very much like yours in build and shape, ours came with a repair kit when new. We have patched pontoons, the air chambers on the floor and around the transom side bits.

I fail to see how yours cannot be repaired. Any place that sells Zodiac will have the repair kits.