Upload & Sell: Off
...I'm looking into the Manfrotto bracket ...but not sure if the stud setup screws into the top of the flash bracket or what. If it does and allows for the 1/4 -20 on top then it should be money.
Yes, the brass fitting, called a spigot, drops into the hole on top of the bracket and is locked in place with the screw with the sliding handle. You can then screw another spigot with the right size threads into that spigot, or just use the threaded spigot in the bracket if a shorter length works. If your adapter then has a female thread, it would screw right onto the male thread of the spigot.
...BrianO, that's pretty much what I was looking for, but where does the umbrella shaft go now?
It will still go into the umbrella hole on the Manfrotto bracket. Your flash will sit higher than it did before, but if you're shooting into an umbrella it shouldn't be a problem. If you're shooting into an Apollo it may be too high, so you may want to rig something to lower the flash.
I did get a couple of those "L" shaped adapters that BrianO suggested in a different thread, but I'm missing something and can't get it to work. Call me dumb, but I can't figure out what it is that I'm missing.
Do you mean the Westcott L bracket for the Mini Apollo? If you can post a photo of what you've done with it so far, I may be able to guide you in the right direction.