When we first started the hoop
house project there was an experiment to use pieces of hose
material cut lengthwise to secure the Agribon fabric to the PVC frame.
It didn't work.
The hose pieces fit nicely
around the PVC pipe, but the pressure was just too much for it to keep
the fabric attached. We ended up making the hoop shorter so that
we could have some extra fabric on the bottom to roll up and weigh down
with 10 foot long sections of rebar and bricks.
You are much farther ahead than those of us farther North. We still have snow on the ground. [envious!]
I have been able to get something similar to work. Instead of using sections of hose, I used sections of PVC to make clips. I don't recall the thickness of the PVC, but I had to cut a lengthwise section out of them since they are not very flexible. Yes, this was a pain to do with a hacksaw and vise to hold them in place, but they worked fairly well and only occasionally popped off. I have heard people using black poly pipe as well, and that will be more flexible. If you want them to stay on fairly permanently, you could use one of these clips and drill through the clip and PVC and secure with a bolt and wing nut.
Your method is what we tried first, and it failed miserably. However, that might be because Mark had got the more expensive "hot/cold" pipes, which seem to be made of a less flexible material.
That said, I ended up liking my method better of just using rebar and bricks to keep the whole bottom of the quick hoop solidly on the ground.