Looks like those clips would work. In the past I actually drilled holes through the top lips of my deep dish saucers and used whatever to tie. I use smart pots exclusivity now and if I need to lst I just use plant wire and tie down to main stem. If I need to lst and main stem isn't option I then drill into saucers as they are so deep I can have holes at top of lips without issue.
Good idea though, I actually think I have a few of these in my junk drawer.