Mounting a Givi S650 child seat

I'm sure everyone has opinions concerning children on motorcycles. If you don't like it, click the "back" button at the top left of your browser and go about your day. This topic is looking for input on the technical aspects of fitting a seat.

I purchased a Givi S650 from overseas with the intent of helping to secure my daughter on the back of my bike. I'm not crazy about the idea of strapping us together, or somehow tethering her to the bike. I like the S650 because it's a durable but flexible rubber and gives enough support to hold a child in place without attaching them. As I'm sure is not surprising to anyone, there's not a huge market for motorcycle or scooter-oriented child seats.

The issue is that the fixing system is not compatible with the pillion seat on the R. I tried it on my F650GS as well, and it wasn't really any better. I've never owned a scooter, but it seems the brackets are intended to hook on a thin but deep lip around the perimeter of the seat pan. The R's seat is more or less flat around its perimeter, which means the bracket protrudes far too much to allow the pillion seat to mount and latch. There are four brackets to attach the seat, and matching threaded holes sunk in the seat itself to which they can be bolted.

I'm looking for suggestions on how to make this work. I could simply bend the hooks on the brackets wider open, but given the angle of bend which would be required I tend to think the metal would fatigue and snap. I could look to put together my own brackets somehow, but I'm frankly not sure what kind of hardware would even begin to work for that.

To be honest, I'm leaning toward fitting some metal buckles to the seat, getting a tougher and stronger strap of thicker nylon, and forgoing the metal bracket pieces altogether. Again, there's no seat belt involved, so the brackets aren't providing some advantage of keeping the child in place on the bike. They're really just there to keep the seat from sliding around. This was frankly what I expected to begin with, and I believe the seat previously came with this kind of setup. You can see in these images (borrowed from an Amazon listing) that the seat at some point came with buckles and straps only, then switched to the current setup with hooked brackets.

Any ideas? I'm sure there are people smarter than me reading this.

Note
To ever so briefly touch on the subject, yes I love my daughter, yes motorcycles are dangerous, and on a long enough timeline everyone's survival rate drops to zero. She's equipped with the same Snell-certified, 5-star UK SHARP-rated Shoei helmet that I wear, in her size. As we get ready for higher speeds we're gearing up with jacket, gloves, etc. We're not traveling long-distance at high speeds, but only around the neighborhood or on local surface streets. I lived in southeast Asia for two years, and if they aren't dying en masse there I think we'll be okay.