I have the tool, but why not just buy a small pack of the fusibles & just try with your clover? My gut reaction is that it will be hot enough.
You have asked a good question about using them on machine embroidery. ME thread is typically poly or rayon which is heat sensitive, however, there are lots and lots of patterns out there digitized specifically to add bling and I've never seen a warning about thread type, so I think you are good. Again if you are concerned, I'd just stitch out part or all of the design & see.