I do not know if that exact one exists but there are a few out there that are fan controls to the top and bottom.
Yours looks ok. It may go right by some layman but others are going to notice it never went into the fan.
Try this...take the selection...and actually put it halfway into the middle of the fan. Close the fan but leave the card pertruding out the back. Then...push this in creating a break and then double under cut the selection to the bottom.
Let me know what you think.
Man, you won't believe this, but the idea you gave me did actually come to my mind even before I read this post

The EXACT (even about double undercut, too). So even though thank you very much for advice. Layman will "eat" it, I guess. And it's a great move for routines. By the way, the edited copy of this thread is
here. And of couse, there are many fan controls (Cherry control, for example) out there. But this one is super easy to do.