I have one of those too.. but when bolted into place, the top is way too close to the seat tube.. and they aren't very nice to look at..
I thought it may be a bit tight, space wise - and agreed, they're not the most pleasing to look at. I used one briefly for a build, but only up to the point I could find a better alternative.
I have a serviceable alternative (having previously set it all up) but think this is possibly a more suitable alternative for the longer term and aesthetically..
I get your thinking - I've got a couple of these force-40 knock-offs, too, and when I used the canti bridge bracket thing out of desperation, I thought of using one of these tektro doo-hickeys - because, like you, they seem more of an aesthetically pleasing thing - but that's as far as I got with using it - thought.
My excuse? I was in a hurry, so did the quick / unsightly thing with the alloy bracket thing, until I got a reasonably servicable stem hanger