I was able to modify a Leaf Switch Bracket from Ponyboy to work with a clear button and GGG's RGB-drive insert. Here's what I did:
Apologies in advance for the absymal photography.1)
Drill a hole in the center of the underside of your pushbutton large enough to accomodate the RGB-Drive LED.
Before:

After:

Put the button aside.
2) This part will take a little care, you need to
cut part of the bracket off of your leaf switch bracket using a strong utility knife. Cut small amounts off at a time,you can always take more off, but you can't put it back on.
You need to take off about as much as shown here, including the bottom portruding part - I estimate it to be 1/16th of an inch.
Hints: a)
Be sure not to cut too close to the hole on the right! If you do it might break when you install it. b) You really can't cut this plastic by drawing the blade along it very well. I found that carefully 'stabbing' it with the tip of a strong utility knife broke off small managable slices.

When I did this and fitted everything, I found that when the button was pressed it would sometimes hit the white bracket or catch on it because I had not taken enough off.

So I carefully trimmed it again. Bingo, perfect fit.
Standard disclaimers, use common sense and caution, at your own risk, etc. You might ruin a few brackets before you get this down. I doubt it, but it's possible. I didn't.